diff --git a/src/components/date_picker/super_date_picker/quick_select_popover/__snapshots__/quick_select_popover.test.tsx.snap b/src/components/date_picker/super_date_picker/quick_select_popover/__snapshots__/quick_select_popover.test.tsx.snap
index 9c8a08945f7..09b2b778b60 100644
--- a/src/components/date_picker/super_date_picker/quick_select_popover/__snapshots__/quick_select_popover.test.tsx.snap
+++ b/src/components/date_picker/super_date_picker/quick_select_popover/__snapshots__/quick_select_popover.test.tsx.snap
@@ -134,6 +134,7 @@ exports[`EuiQuickSelectPanels customQuickSelectPanels should render custom panel
           >
             <input
               aria-describedby="generated-id generated-id"
+              aria-invalid="false"
               aria-label="Time value"
               class="euiFieldNumber euiFieldNumber--compressed"
               type="number"
diff --git a/src/components/form/field_number/__snapshots__/field_number.test.tsx.snap b/src/components/form/field_number/__snapshots__/field_number.test.tsx.snap
index cb7de7ebd8f..ae5a51c949d 100644
--- a/src/components/form/field_number/__snapshots__/field_number.test.tsx.snap
+++ b/src/components/form/field_number/__snapshots__/field_number.test.tsx.snap
@@ -6,10 +6,12 @@ exports[`EuiFieldNumber is rendered 1`] = `
   fullwidth="false"
   icon="warning"
   inputid="1"
+  isinvalid="false"
   isloading="false"
 >
   <eui-validatable-control>
     <input
+      aria-invalid="false"
       aria-label="aria-label"
       class="euiFieldNumber testClass1 testClass2 euiFieldNumber--withIcon"
       data-test-subj="test subject string"
@@ -28,8 +30,10 @@ exports[`EuiFieldNumber is rendered 1`] = `
 exports[`EuiFieldNumber props controlOnly is rendered 1`] = `
 <eui-validatable-control>
   <input
+    aria-invalid="false"
     class="euiFieldNumber"
     type="number"
+    value=""
   />
 </eui-validatable-control>
 `;
@@ -38,18 +42,21 @@ exports[`EuiFieldNumber props fullWidth is rendered 1`] = `
 <eui-form-control-layout
   compressed="false"
   fullwidth="true"
+  isinvalid="false"
   isloading="false"
 >
   <eui-validatable-control>
     <input
+      aria-invalid="false"
       class="euiFieldNumber euiFieldNumber--fullWidth"
       type="number"
+      value=""
     />
   </eui-validatable-control>
 </eui-form-control-layout>
 `;
 
-exports[`EuiFieldNumber props isInvalid is rendered 1`] = `
+exports[`EuiFieldNumber props isInvalid is rendered from a prop 1`] = `
 <eui-form-control-layout
   compressed="false"
   fullwidth="false"
@@ -60,8 +67,10 @@ exports[`EuiFieldNumber props isInvalid is rendered 1`] = `
     isinvalid="true"
   >
     <input
+      aria-invalid="true"
       class="euiFieldNumber euiFormControlLayout--1icons"
       type="number"
+      value=""
     />
   </eui-validatable-control>
 </eui-form-control-layout>
@@ -71,12 +80,15 @@ exports[`EuiFieldNumber props isLoading is rendered 1`] = `
 <eui-form-control-layout
   compressed="false"
   fullwidth="false"
+  isinvalid="false"
   isloading="true"
 >
   <eui-validatable-control>
     <input
+      aria-invalid="false"
       class="euiFieldNumber euiFormControlLayout--1icons euiFieldNumber-isLoading"
       type="number"
+      value=""
     />
   </eui-validatable-control>
 </eui-form-control-layout>
@@ -86,14 +98,17 @@ exports[`EuiFieldNumber props readOnly is rendered 1`] = `
 <eui-form-control-layout
   compressed="false"
   fullwidth="false"
+  isinvalid="false"
   isloading="false"
   readonly="true"
 >
   <eui-validatable-control>
     <input
+      aria-invalid="false"
       class="euiFieldNumber"
       readonly=""
       type="number"
+      value=""
     />
   </eui-validatable-control>
 </eui-form-control-layout>
@@ -103,10 +118,12 @@ exports[`EuiFieldNumber props value no initial value 1`] = `
 <eui-form-control-layout
   compressed="false"
   fullwidth="false"
+  isinvalid="false"
   isloading="false"
 >
   <eui-validatable-control>
     <input
+      aria-invalid="false"
       class="euiFieldNumber"
       type="number"
       value=""
@@ -119,10 +136,12 @@ exports[`EuiFieldNumber props value value is number 1`] = `
 <eui-form-control-layout
   compressed="false"
   fullwidth="false"
+  isinvalid="false"
   isloading="false"
 >
   <eui-validatable-control>
     <input
+      aria-invalid="false"
       class="euiFieldNumber"
       type="number"
       value="0"
diff --git a/src/components/form/field_number/field_number.spec.tsx b/src/components/form/field_number/field_number.spec.tsx
new file mode 100644
index 00000000000..a2621d95e5a
--- /dev/null
+++ b/src/components/form/field_number/field_number.spec.tsx
@@ -0,0 +1,55 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+/// <reference types="cypress" />
+/// <reference types="cypress-real-events" />
+/// <reference types="../../../../cypress/support" />
+
+import React from 'react';
+import { EuiFieldNumber } from './field_number';
+
+describe('EuiFieldNumber', () => {
+  describe('isNativelyInvalid', () => {
+    const checkIsValid = () => {
+      cy.get('[aria-invalid="true"]').should('not.exist');
+      cy.get('.euiFormControlLayoutIcons').should('not.exist');
+    };
+    const checkIsInvalid = () => {
+      cy.get('[aria-invalid="true"]').should('exist');
+      cy.get('.euiFormControlLayoutIcons').should('exist');
+    };
+
+    it('when the value is not a valid number', () => {
+      cy.mount(<EuiFieldNumber />);
+      checkIsValid();
+      cy.get('input').click().realType('-.');
+      checkIsInvalid();
+    });
+
+    it('sets invalid state when the value is less than the passed min', () => {
+      cy.mount(<EuiFieldNumber min={0} />);
+      checkIsValid();
+      cy.get('input').click().type('-10');
+      checkIsInvalid();
+    });
+
+    it('sets invalid state when the value is greater than the passed max', () => {
+      cy.mount(<EuiFieldNumber max={100} />);
+      checkIsValid();
+      cy.get('input').click().type('101');
+      checkIsInvalid();
+    });
+
+    it('sets invalid state when the value is not a valid step', () => {
+      cy.mount(<EuiFieldNumber step={3} />);
+      checkIsValid();
+      cy.get('input').click().type('2');
+      checkIsInvalid();
+    });
+  });
+});
diff --git a/src/components/form/field_number/field_number.test.tsx b/src/components/form/field_number/field_number.test.tsx
index a734c4be1cd..5ce42c0715e 100644
--- a/src/components/form/field_number/field_number.test.tsx
+++ b/src/components/form/field_number/field_number.test.tsx
@@ -7,7 +7,7 @@
  */
 
 import React from 'react';
-import { render } from 'enzyme';
+import { render } from '../../../test/rtl';
 import { requiredProps } from '../../../test/required_props';
 
 import { EuiForm } from '../form';
@@ -26,7 +26,7 @@ jest.mock('../validatable_control', () => ({
 
 describe('EuiFieldNumber', () => {
   test('is rendered', () => {
-    const component = render(
+    const { container } = render(
       <EuiFieldNumber
         id="1"
         name="elastic"
@@ -40,68 +40,77 @@ describe('EuiFieldNumber', () => {
       />
     );
 
-    expect(component).toMatchSnapshot();
+    expect(container.firstChild).toMatchSnapshot();
   });
 
   describe('props', () => {
-    test('isInvalid is rendered', () => {
-      const component = render(<EuiFieldNumber isInvalid />);
+    test('isInvalid is rendered from a prop', () => {
+      const { container } = render(<EuiFieldNumber isInvalid />);
 
-      expect(component).toMatchSnapshot();
+      expect(container.firstChild).toMatchSnapshot();
     });
 
     test('fullWidth is rendered', () => {
-      const component = render(<EuiFieldNumber fullWidth />);
+      const { container } = render(<EuiFieldNumber fullWidth />);
 
-      expect(component).toMatchSnapshot();
+      expect(container.firstChild).toMatchSnapshot();
     });
 
     test('isLoading is rendered', () => {
-      const component = render(<EuiFieldNumber isLoading />);
+      const { container } = render(<EuiFieldNumber isLoading />);
 
-      expect(component).toMatchSnapshot();
+      expect(container.firstChild).toMatchSnapshot();
     });
 
     test('readOnly is rendered', () => {
-      const component = render(<EuiFieldNumber readOnly />);
+      const { container } = render(<EuiFieldNumber readOnly />);
 
-      expect(component).toMatchSnapshot();
+      expect(container.firstChild).toMatchSnapshot();
     });
 
     test('controlOnly is rendered', () => {
-      const component = render(<EuiFieldNumber controlOnly />);
+      const { container } = render(<EuiFieldNumber controlOnly />);
 
-      expect(component).toMatchSnapshot();
+      expect(container.firstChild).toMatchSnapshot();
+    });
+
+    test('inputRef', () => {
+      const inputRef = jest.fn();
+      const { container } = render(<EuiFieldNumber inputRef={inputRef} />);
+
+      expect(inputRef).toHaveBeenCalledTimes(1);
+      expect(container.querySelector('input[type="number"]')).toBe(
+        inputRef.mock.calls[0][0]
+      );
     });
 
     describe('value', () => {
       test('value is number', () => {
-        const component = render(
+        const { container } = render(
           <EuiFieldNumber value={0} onChange={() => {}} />
         );
-        expect(component).toMatchSnapshot();
+        expect(container.firstChild).toMatchSnapshot();
       });
 
       test('no initial value', () => {
-        const component = render(
+        const { container } = render(
           <EuiFieldNumber value={''} onChange={() => {}} />
         );
-        expect(component).toMatchSnapshot();
+        expect(container.firstChild).toMatchSnapshot();
       });
     });
   });
 
   describe('inherits', () => {
     test('fullWidth from <EuiForm />', () => {
-      const component = render(
+      const { container } = render(
         <EuiForm fullWidth>
           <EuiFieldNumber />
         </EuiForm>
       );
+      const control = container.querySelector('.euiFieldNumber')!;
 
-      if (
-        !component.find('.euiFieldNumber').hasClass('euiFieldNumber--fullWidth')
-      ) {
+      if (!control.classList.contains('euiFieldNumber--fullWidth')) {
         throw new Error(
           'expected EuiFieldNumber to inherit fullWidth from EuiForm'
         );
diff --git a/src/components/form/field_number/field_number.tsx b/src/components/form/field_number/field_number.tsx
index 777e287f379..24f9c21a28f 100644
--- a/src/components/form/field_number/field_number.tsx
+++ b/src/components/form/field_number/field_number.tsx
@@ -6,20 +6,27 @@
  * Side Public License, v 1.
  */
 
-import React, { InputHTMLAttributes, Ref, FunctionComponent } from 'react';
+import React, {
+  InputHTMLAttributes,
+  Ref,
+  FunctionComponent,
+  useState,
+  useRef,
+  useCallback,
+} from 'react';
 import { CommonProps } from '../../common';
 import classNames from 'classnames';
 
+import { useCombinedRefs } from '../../../services';
+import { IconType } from '../../icon';
+
+import { EuiValidatableControl } from '../validatable_control';
 import {
   EuiFormControlLayout,
   EuiFormControlLayoutProps,
 } from '../form_control_layout';
-
-import { EuiValidatableControl } from '../validatable_control';
-
-import { IconType } from '../../icon';
-import { useFormContext } from '../eui_form_context';
 import { getFormControlClassNameForIconCount } from '../form_control_layout/_num_icons';
+import { useFormContext } from '../eui_form_context';
 
 export type EuiFieldNumberProps = Omit<
   InputHTMLAttributes<HTMLInputElement>,
@@ -96,13 +103,37 @@ export const EuiFieldNumber: FunctionComponent<EuiFieldNumberProps> = (
     inputRef,
     readOnly,
     controlOnly,
+    onKeyDown: _onKeyDown,
     ...rest
   } = props;
 
-  const numIconsClass = getFormControlClassNameForIconCount({
-    isInvalid,
-    isLoading,
-  });
+  // Attempt to determine additional invalid state. The native number input
+  // will set :invalid state automatically, but we need to also set
+  // `aria-invalid` as well as display an icon. We also want to *not* set this on
+  // EuiValidatableControl, in order to not override custom validity messages
+  const [isNativelyInvalid, setIsNativelyInvalid] = useState(false);
+  const validityRef = useRef<HTMLInputElement | null>(null);
+  const setRefs = useCombinedRefs([validityRef, inputRef]);
+
+  // Note that we can't use hook into `onChange` because browsers don't emit change events
+  // for invalid values - see https://github.com/facebook/react/issues/16554
+  const onKeyDown = useCallback(
+    (e: React.KeyboardEvent<HTMLInputElement>) => {
+      _onKeyDown?.(e);
+      // Wait a beat before checking validity - we can't use `e.target` as it's stale
+      requestAnimationFrame(() => {
+        setIsNativelyInvalid(!validityRef.current!.validity.valid);
+      });
+    },
+    [_onKeyDown]
+  );
+
+  const numIconsClass = controlOnly
+    ? false
+    : getFormControlClassNameForIconCount({
+        isInvalid: isInvalid || isNativelyInvalid,
+        isLoading,
+      });
 
   const classes = classNames('euiFieldNumber', className, numIconsClass, {
     'euiFieldNumber--withIcon': icon,
@@ -124,7 +155,9 @@ export const EuiFieldNumber: FunctionComponent<EuiFieldNumberProps> = (
         placeholder={placeholder}
         readOnly={readOnly}
         className={classes}
-        ref={inputRef}
+        ref={setRefs}
+        onKeyDown={onKeyDown}
+        aria-invalid={isInvalid || isNativelyInvalid}
         {...rest}
       />
     </EuiValidatableControl>
@@ -139,7 +172,7 @@ export const EuiFieldNumber: FunctionComponent<EuiFieldNumberProps> = (
       icon={icon}
       fullWidth={fullWidth}
       isLoading={isLoading}
-      isInvalid={isInvalid}
+      isInvalid={isInvalid || isNativelyInvalid}
       compressed={compressed}
       readOnly={readOnly}
       prepend={prepend}
diff --git a/src/components/form/field_text/field_text.tsx b/src/components/form/field_text/field_text.tsx
index 5c75564de71..3a40234d5ed 100644
--- a/src/components/form/field_text/field_text.tsx
+++ b/src/components/form/field_text/field_text.tsx
@@ -78,10 +78,12 @@ export const EuiFieldText: FunctionComponent<EuiFieldTextProps> = (props) => {
     ...rest
   } = props;
 
-  const numIconsClass = getFormControlClassNameForIconCount({
-    isInvalid,
-    isLoading,
-  });
+  const numIconsClass = controlOnly
+    ? false
+    : getFormControlClassNameForIconCount({
+        isInvalid,
+        isLoading,
+      });
 
   const classes = classNames('euiFieldText', className, numIconsClass, {
     'euiFieldText--withIcon': icon,
diff --git a/src/components/form/form_control_layout/__snapshots__/form_control_layout_delimited.test.tsx.snap b/src/components/form/form_control_layout/__snapshots__/form_control_layout_delimited.test.tsx.snap
index bac34682d28..3f396138333 100644
--- a/src/components/form/form_control_layout/__snapshots__/form_control_layout_delimited.test.tsx.snap
+++ b/src/components/form/form_control_layout/__snapshots__/form_control_layout_delimited.test.tsx.snap
@@ -15,9 +15,14 @@ exports[`EuiFormControlLayoutDelimited is rendered 1`] = `
       start
     </span>
     <div
-      class="euiText euiFormControlLayoutDelimited__delimeter emotion-euiText-s-euiTextColor-subdued"
+      class="euiText euiFormControlLayoutDelimited__delimiter emotion-euiText-s-euiTextColor-subdued"
     >
-      →
+      <span
+        color="subdued"
+        data-euiicon-type="sortRight"
+      >
+        to
+      </span>
     </div>
     <span
       class="euiFormControlLayoutDelimited__input"
@@ -41,7 +46,7 @@ exports[`EuiFormControlLayoutDelimited props delimiter is rendered as a node 1`]
       start
     </span>
     <div
-      class="euiText euiFormControlLayoutDelimited__delimeter emotion-euiText-s-euiTextColor-subdued"
+      class="euiText euiFormControlLayoutDelimited__delimiter emotion-euiText-s-euiTextColor-subdued"
     >
       <span
         data-euiicon-type="error"
@@ -69,7 +74,7 @@ exports[`EuiFormControlLayoutDelimited props delimiter is rendered as a string 1
       start
     </span>
     <div
-      class="euiText euiFormControlLayoutDelimited__delimeter emotion-euiText-s-euiTextColor-subdued"
+      class="euiText euiFormControlLayoutDelimited__delimiter emotion-euiText-s-euiTextColor-subdued"
     >
       +
     </div>
diff --git a/src/components/form/form_control_layout/_form_control_layout_delimited.scss b/src/components/form/form_control_layout/_form_control_layout_delimited.scss
index 75c5a942d52..635e1087baf 100644
--- a/src/components/form/form_control_layout/_form_control_layout_delimited.scss
+++ b/src/components/form/form_control_layout/_form_control_layout_delimited.scss
@@ -5,7 +5,8 @@
   align-items: stretch;
   padding: 1px; /* 1 */
 
-  .euiFormControlLayoutDelimited__delimeter {
+  .euiFormControlLayoutDelimited__delimiter,
+  .euiFormControlLayoutIcons {
     background-color: $euiFormBackgroundColor;
   }
 
@@ -28,8 +29,7 @@
     }
 
     .euiFormControlLayoutIcons {
-      padding-left: $euiFormControlCompressedPadding;
-      padding-right: $euiFormControlCompressedPadding;
+      padding-inline: $euiFormControlCompressedPadding;
     }
   }
 
@@ -44,7 +44,8 @@
   &[class*='-isDisabled'] {
     @include euiFormControlDisabledStyle;
 
-    .euiFormControlLayoutDelimited__delimeter {
+    .euiFormControlLayoutDelimited__delimiter,
+    .euiFormControlLayoutIcons {
       background-color: $euiFormBackgroundDisabledColor;
     }
   }
@@ -54,7 +55,8 @@
     @include euiFormControlReadOnlyStyle;
 
     input,
-    .euiFormControlLayoutDelimited__delimeter {
+    .euiFormControlLayoutDelimited__delimiter,
+    .euiFormControlLayoutIcons {
       background-color: $euiFormBackgroundReadOnlyColor;
     }
   }
@@ -63,13 +65,18 @@
     // Absolutely positioning the icons doesn't work because they
     // overlay only one of controls making the layout unbalanced
     position: static; // Overrider absolute
-    padding-left: $euiFormControlPadding;
-    padding-right: $euiFormControlPadding;
+    padding-inline: $euiFormControlPadding;
+    align-self: stretch;
+    flex-grow: 0;
 
     &:not(.euiFormControlLayoutIcons--right) {
       order: -1;
     }
   }
+
+  &--isInvalid .euiFormControlLayoutIcons {
+    @include euiFormControlInvalidStyle;
+  }
 }
 
 .euiFormControlLayoutDelimited__input {
@@ -82,10 +89,14 @@
   min-width: 0; // Fixes FF
 }
 
-.euiFormControlLayoutDelimited__delimeter {
-  // stylelint-disable-next-line declaration-no-important
-  line-height: 1 !important; // Override EuiText line-height
-  flex: 0 0 auto;
-  padding-left: $euiFormControlPadding / 2;
-  padding-right: $euiFormControlPadding / 2;
+.euiFormControlLayoutDelimited__delimiter {
+  align-self: stretch;
+  flex-grow: 0;
+  display: flex;
+  align-items: center;
+  line-height: 1; // Override EuiText line-height
+
+  &--isInvalid {
+    @include euiFormControlInvalidStyle;
+  }
 }
diff --git a/src/components/form/form_control_layout/form_control_layout_delimited.tsx b/src/components/form/form_control_layout/form_control_layout_delimited.tsx
index 683df9f655f..43ec8a79a20 100644
--- a/src/components/form/form_control_layout/form_control_layout_delimited.tsx
+++ b/src/components/form/form_control_layout/form_control_layout_delimited.tsx
@@ -14,7 +14,10 @@ import React, {
 } from 'react';
 import classNames from 'classnames';
 
+import { useEuiI18n } from '../../i18n';
+import { EuiIcon } from '../../icon';
 import { EuiText } from '../../text';
+
 import {
   EuiFormControlLayout,
   EuiFormControlLayoutProps,
@@ -42,32 +45,60 @@ export type EuiFormControlLayoutDelimitedProps = Partial<
 export const EuiFormControlLayoutDelimited: FunctionComponent<EuiFormControlLayoutDelimitedProps> = ({
   startControl,
   endControl,
-  delimiter = '→',
+  delimiter,
   className,
   ...rest
 }) => {
-  const classes = classNames('euiFormControlLayoutDelimited', className);
+  const { isInvalid, isDisabled, readOnly } = rest;
+  const showInvalidState = isInvalid && !isDisabled && !readOnly;
+
+  const classes = classNames('euiFormControlLayoutDelimited', className, {
+    'euiFormControlLayoutDelimited--isInvalid': showInvalidState,
+  });
 
   return (
     <EuiFormControlLayout className={classes} {...rest}>
       {addClassesToControl(startControl)}
-      <EuiText
-        className="euiFormControlLayoutDelimited__delimeter"
-        size="s"
-        color="subdued"
-      >
-        {delimiter}
-      </EuiText>
+      <EuiFormControlDelimiter
+        delimiter={delimiter}
+        isInvalid={showInvalidState}
+      />
       {addClassesToControl(endControl)}
     </EuiFormControlLayout>
   );
 };
 
-function addClassesToControl(control: ReactElement) {
+const addClassesToControl = (control: ReactElement) => {
   return cloneElement(control, {
     className: classNames(
       control.props.className,
       'euiFormControlLayoutDelimited__input'
     ),
   });
-}
+};
+
+const EuiFormControlDelimiter = ({
+  delimiter,
+  isInvalid,
+}: {
+  delimiter?: ReactNode;
+  isInvalid?: boolean;
+}) => {
+  const classes = classNames('euiFormControlLayoutDelimited__delimiter', {
+    'euiFormControlLayoutDelimited__delimiter--isInvalid': isInvalid,
+  });
+  const color = isInvalid ? 'danger' : 'subdued';
+
+  const defaultAriaLabel = useEuiI18n(
+    'euiFormControlLayoutDelimited.delimiterLabel',
+    'to'
+  );
+
+  return (
+    <EuiText className={classes} size="s" color={color}>
+      {delimiter ?? (
+        <EuiIcon color={color} type="sortRight" aria-label={defaultAriaLabel} />
+      )}
+    </EuiText>
+  );
+};
diff --git a/src/components/form/range/__snapshots__/dual_range.test.tsx.snap b/src/components/form/range/__snapshots__/dual_range.test.tsx.snap
index 1a703bac6fb..759b2fa8f74 100644
--- a/src/components/form/range/__snapshots__/dual_range.test.tsx.snap
+++ b/src/components/form/range/__snapshots__/dual_range.test.tsx.snap
@@ -63,13 +63,14 @@ exports[`EuiDualRange input props can be applied to min and max inputs 1`] = `
       class="euiFormControlLayout__childrenWrapper"
     >
       <input
+        aria-invalid="false"
         aria-label="Min value"
         class="euiFieldNumber euiRangeInput euiRangeInput--min emotion-euiRangeInput"
         max="8"
         min="1"
         name="name-minValue"
         step="1"
-        style="inline-size:3.6em"
+        style="inline-size:calc(12px + 1ch + 2em + 0px)"
         type="number"
         value="1"
       />
@@ -112,13 +113,14 @@ exports[`EuiDualRange input props can be applied to min and max inputs 1`] = `
       class="euiFormControlLayout__childrenWrapper"
     >
       <input
+        aria-invalid="false"
         aria-label="Max value"
         class="euiFieldNumber euiRangeInput euiRangeInput--max emotion-euiRangeInput"
         max="10"
         min="1"
         name="name-maxValue"
         step="1"
-        style="inline-size:3.6em"
+        style="inline-size:calc(12px + 1ch + 2em + 0px)"
         type="number"
         value="8"
       />
@@ -321,13 +323,14 @@ exports[`EuiDualRange props inputs should render 1`] = `
       class="euiFormControlLayout__childrenWrapper"
     >
       <input
+        aria-invalid="false"
         aria-label="aria-label"
         class="euiFieldNumber euiRangeInput euiRangeInput--min emotion-euiRangeInput"
         max="8"
         min="0"
         name="name-minValue"
         step="1"
-        style="inline-size:4.4em"
+        style="inline-size:calc(12px + 1ch + 2em + 0px)"
         type="number"
         value="1"
       />
@@ -372,13 +375,14 @@ exports[`EuiDualRange props inputs should render 1`] = `
       class="euiFormControlLayout__childrenWrapper"
     >
       <input
+        aria-invalid="false"
         aria-label="aria-label"
         class="euiFieldNumber euiRangeInput euiRangeInput--max emotion-euiRangeInput"
         max="100"
         min="1"
         name="name-maxValue"
         step="1"
-        style="inline-size:4.4em"
+        style="inline-size:calc(12px + 1ch + 2em + 0px)"
         type="number"
         value="8"
       />
@@ -528,6 +532,7 @@ exports[`EuiDualRange props loading should display when showInput="inputWithPopo
           class="euiFormControlLayout__childrenWrapper"
         >
           <input
+            aria-invalid="false"
             class="euiFieldNumber euiFormControlLayoutDelimited__input emotion-euiRangeInput"
             max="8"
             min="0"
@@ -537,11 +542,17 @@ exports[`EuiDualRange props loading should display when showInput="inputWithPopo
             value="1"
           />
           <div
-            class="euiText euiFormControlLayoutDelimited__delimeter emotion-euiText-s-euiTextColor-subdued"
+            class="euiText euiFormControlLayoutDelimited__delimiter emotion-euiText-s-euiTextColor-subdued"
           >
-            →
+            <span
+              color="subdued"
+              data-euiicon-type="sortRight"
+            >
+              to
+            </span>
           </div>
           <input
+            aria-invalid="false"
             class="euiFieldNumber euiFormControlLayoutDelimited__input emotion-euiRangeInput"
             max="100"
             min="1"
@@ -611,6 +622,7 @@ exports[`EuiDualRange props slider should display in popover 1`] = `
           class="euiFormControlLayout__childrenWrapper"
         >
           <input
+            aria-invalid="false"
             class="euiFieldNumber euiFormControlLayoutDelimited__input emotion-euiRangeInput"
             max="8"
             min="0"
@@ -620,11 +632,17 @@ exports[`EuiDualRange props slider should display in popover 1`] = `
             value="1"
           />
           <div
-            class="euiText euiFormControlLayoutDelimited__delimeter emotion-euiText-s-euiTextColor-subdued"
+            class="euiText euiFormControlLayoutDelimited__delimiter emotion-euiText-s-euiTextColor-subdued"
           >
-            →
+            <span
+              color="subdued"
+              data-euiicon-type="sortRight"
+            >
+              to
+            </span>
           </div>
           <input
+            aria-invalid="false"
             class="euiFieldNumber euiFormControlLayoutDelimited__input emotion-euiRangeInput"
             max="100"
             min="1"
diff --git a/src/components/form/range/__snapshots__/range.test.tsx.snap b/src/components/form/range/__snapshots__/range.test.tsx.snap
index 70243ee2bfd..5620cb5b99b 100644
--- a/src/components/form/range/__snapshots__/range.test.tsx.snap
+++ b/src/components/form/range/__snapshots__/range.test.tsx.snap
@@ -255,6 +255,7 @@ exports[`EuiRange props input should render 1`] = `
       class="euiFormControlLayout__childrenWrapper"
     >
       <input
+        aria-invalid="false"
         aria-label="aria-label"
         class="euiFieldNumber euiRangeInput euiRangeInput--max emotion-euiRangeInput"
         data-test-subj="test subject string"
@@ -263,7 +264,7 @@ exports[`EuiRange props input should render 1`] = `
         min="0"
         name="name"
         step="1"
-        style="inline-size:4.4em"
+        style="inline-size:calc(12px + 1ch + 2em + 0px)"
         type="number"
         value="8"
       />
@@ -354,6 +355,7 @@ exports[`EuiRange props loading should display when showInput="inputWithPopover"
           class="euiFormControlLayout__childrenWrapper"
         >
           <input
+            aria-invalid="false"
             aria-label="aria-label"
             class="euiFieldNumber euiRangeInput euiRangeInput--max emotion-euiRangeInput euiFormControlLayout--1icons euiFieldNumber-isLoading"
             data-test-subj="test subject string"
@@ -426,6 +428,7 @@ exports[`EuiRange props slider should display in popover 1`] = `
           class="euiFormControlLayout__childrenWrapper"
         >
           <input
+            aria-invalid="false"
             aria-label="aria-label"
             class="euiFieldNumber euiRangeInput euiRangeInput--max emotion-euiRangeInput"
             data-test-subj="test subject string"
diff --git a/src/components/form/range/__snapshots__/range_input.test.tsx.snap b/src/components/form/range/__snapshots__/range_input.test.tsx.snap
new file mode 100644
index 00000000000..92b5956b999
--- /dev/null
+++ b/src/components/form/range/__snapshots__/range_input.test.tsx.snap
@@ -0,0 +1,21 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`EuiRangeInput renders 1`] = `
+<div
+  class="euiFormControlLayout"
+>
+  <div
+    class="euiFormControlLayout__childrenWrapper"
+  >
+    <input
+      aria-invalid="false"
+      class="euiFieldNumber euiRangeInput euiRangeInput--max emotion-euiRangeInput"
+      max="100"
+      min="0"
+      style="inline-size: calc(12px + 1ch + 2em + 0px);"
+      type="number"
+      value="0"
+    />
+  </div>
+</div>
+`;
diff --git a/src/components/form/range/dual_range.tsx b/src/components/form/range/dual_range.tsx
index 0d1592827d8..fdcf835382f 100644
--- a/src/components/form/range/dual_range.tsx
+++ b/src/components/form/range/dual_range.tsx
@@ -466,7 +466,6 @@ export class EuiDualRangeClass extends Component<
 
     const { id } = this.state;
 
-    const digitTolerance = Math.max(String(min).length, String(max).length);
     const showInputOnly = showInput === 'inputWithPopover';
     const canShowDropdown = showInputOnly && !readOnly && !disabled;
 
@@ -479,7 +478,6 @@ export class EuiDualRangeClass extends Component<
         aria-label={this.props['aria-label']}
         {...minInputProps}
         // Non-overridable props
-        digitTolerance={digitTolerance}
         side="min"
         min={min}
         max={Number(this.upperValue)}
@@ -510,7 +508,6 @@ export class EuiDualRangeClass extends Component<
         aria-label={this.props['aria-label']}
         {...maxInputProps}
         // Non-overridable props
-        digitTolerance={digitTolerance}
         side="max"
         min={Number(this.lowerValue)}
         max={max}
@@ -755,6 +752,7 @@ export class EuiDualRangeClass extends Component<
             append={append}
             prepend={prepend}
             isLoading={isLoading}
+            isInvalid={isInvalid}
           />
         }
         fullWidth={fullWidth}
diff --git a/src/components/form/range/range.tsx b/src/components/form/range/range.tsx
index 5f1f4f30d6a..622ed3b8aca 100644
--- a/src/components/form/range/range.tsx
+++ b/src/components/form/range/range.tsx
@@ -147,7 +147,6 @@ export class EuiRangeClass extends Component<
 
     const { id } = this.state;
 
-    const digitTolerance = Math.max(String(min).length, String(max).length);
     const showInputOnly = showInput === 'inputWithPopover';
     const canShowDropdown = showInputOnly && !readOnly && !disabled;
 
@@ -156,7 +155,6 @@ export class EuiRangeClass extends Component<
         id={id}
         min={min}
         max={max}
-        digitTolerance={digitTolerance}
         step={step}
         value={value}
         readOnly={readOnly}
diff --git a/src/components/form/range/range_input.test.tsx b/src/components/form/range/range_input.test.tsx
new file mode 100644
index 00000000000..17516aa71e2
--- /dev/null
+++ b/src/components/form/range/range_input.test.tsx
@@ -0,0 +1,114 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import React from 'react';
+import { render } from '../../../test/rtl';
+import { shouldRenderCustomStyles } from '../../../test/internal';
+
+import { EuiRangeInput } from './range_input';
+
+const requiredProps = {
+  min: 0,
+  max: 100,
+  value: 0,
+  onChange: () => {},
+};
+
+describe('EuiRangeInput', () => {
+  shouldRenderCustomStyles(<EuiRangeInput {...requiredProps} />);
+
+  it('renders', () => {
+    const { container } = render(<EuiRangeInput {...requiredProps} />);
+    expect(container.firstChild).toMatchSnapshot();
+  });
+
+  describe('widthStyle', () => {
+    it('does not set a width style if the `autoSize` is set to false', () => {
+      const { container } = render(
+        <EuiRangeInput {...requiredProps} autoSize={false} />
+      );
+      const widthStyle = container
+        .querySelector('.euiRangeInput')
+        ?.getAttribute('style');
+
+      expect(widthStyle).toBeFalsy();
+    });
+
+    it('increases input character width dynamically based on value', () => {
+      const { rerender, container } = render(
+        <EuiRangeInput {...requiredProps} value="0" />
+      );
+      const getWidthStyle = () =>
+        container.querySelector('.euiRangeInput')?.getAttribute('style');
+
+      expect(getWidthStyle()).toMatchInlineSnapshot(
+        '"inline-size: calc(12px + 1ch + 2em + 0px);"'
+      );
+
+      rerender(<EuiRangeInput {...requiredProps} value="10" />);
+      expect(getWidthStyle()).toMatchInlineSnapshot(
+        '"inline-size: calc(12px + 2ch + 2em + 0px);"'
+      );
+
+      rerender(<EuiRangeInput {...requiredProps} value="100" />);
+      expect(getWidthStyle()).toMatchInlineSnapshot(
+        '"inline-size: calc(12px + 3ch + 2em + 0px);"'
+      );
+
+      rerender(<EuiRangeInput {...requiredProps} value="1000" />);
+      expect(getWidthStyle()).toMatchInlineSnapshot(
+        '"inline-size: calc(12px + 4ch + 2em + 22px);"'
+      );
+
+      // Should not go above 4 characters in width
+      rerender(<EuiRangeInput {...requiredProps} value="10000" />);
+      expect(getWidthStyle()).toMatchInlineSnapshot(
+        '"inline-size: calc(12px + 4ch + 2em + 22px);"'
+      );
+    });
+
+    test('compressed', () => {
+      const { container } = render(
+        <EuiRangeInput {...requiredProps} compressed />
+      );
+      const widthStyle = container
+        .querySelector('.euiRangeInput')
+        ?.getAttribute('style');
+
+      expect(widthStyle).toMatchInlineSnapshot(
+        '"inline-size: calc(8px + 1ch + 2em + 0px);"'
+      );
+    });
+
+    test('invalid', () => {
+      const { container } = render(
+        <EuiRangeInput {...requiredProps} isInvalid />
+      );
+      const widthStyle = container
+        .querySelector('.euiRangeInput')
+        ?.getAttribute('style');
+
+      expect(widthStyle).toMatchInlineSnapshot(
+        '"inline-size: calc(12px + 1ch + 2em + 22px);"'
+      );
+    });
+
+    test('invalid + compressed', () => {
+      const { container } = render(
+        <EuiRangeInput {...requiredProps} isInvalid compressed />
+      );
+      const widthStyle = container
+        .querySelector('.euiRangeInput')
+        ?.getAttribute('style');
+
+      expect(widthStyle).toMatchInlineSnapshot(
+        '"inline-size: calc(8px + 1ch + 2em + 18px);"'
+      );
+    });
+  });
+});
diff --git a/src/components/form/range/range_input.tsx b/src/components/form/range/range_input.tsx
index 621aa5b1370..ad3d41271d2 100644
--- a/src/components/form/range/range_input.tsx
+++ b/src/components/form/range/range_input.tsx
@@ -6,10 +6,17 @@
  * Side Public License, v 1.
  */
 
-import React, { FunctionComponent, useMemo } from 'react';
+import React, {
+  FunctionComponent,
+  useState,
+  useEffect,
+  useMemo,
+  useRef,
+} from 'react';
 
-import { useEuiTheme } from '../../../services';
+import { useEuiTheme, useCombinedRefs } from '../../../services';
 import { logicalStyles } from '../../../global_styling';
+import { euiFormVariables } from '../form.styles';
 import { EuiFieldNumber, EuiFieldNumberProps } from '../field_number';
 
 import type { _SingleRangeValue, _SharedRangeInputSide } from './types';
@@ -20,7 +27,6 @@ export interface EuiRangeInputProps
     Omit<_SingleRangeValue, 'onChange'>,
     _SharedRangeInputSide {
   autoSize?: boolean;
-  digitTolerance: number;
 }
 
 export const EuiRangeInput: FunctionComponent<EuiRangeInputProps> = ({
@@ -28,29 +34,60 @@ export const EuiRangeInput: FunctionComponent<EuiRangeInputProps> = ({
   max,
   step,
   value,
+  inputRef,
+  isInvalid,
   disabled,
   compressed,
   onChange,
   name,
   side = 'max',
-  digitTolerance,
   fullWidth,
   autoSize = true,
   ...rest
 }) => {
-  // Chrome will properly size the input based on the max value, but FF does not.
-  // Calculate the width of the input based on highest number of characters.
-  // Add 2 to accommodate for input stepper
-  const widthStyle = useMemo(() => {
-    return autoSize
-      ? logicalStyles({ width: `${digitTolerance / 1.25 + 2}em` })
-      : {};
-  }, [autoSize, digitTolerance]);
-
   const euiTheme = useEuiTheme();
   const styles = euiRangeInputStyles(euiTheme);
   const cssStyles = [styles.euiRangeInput];
 
+  // Determine whether an invalid icon is showing, which can come from
+  // the underlying EuiFieldNumber's native :invalid state
+  const [hasInvalidIcon, setHasInvalidIcon] = useState(isInvalid);
+  const validityRef = useRef<HTMLInputElement | null>(null);
+  const setRefs = useCombinedRefs([validityRef, inputRef]);
+
+  useEffect(() => {
+    const isNativelyInvalid = !validityRef.current?.validity.valid;
+    setHasInvalidIcon(isNativelyInvalid || isInvalid);
+  }, [value, isInvalid]);
+
+  // Calculate the auto size width of the input
+  const widthStyle = useMemo(() => {
+    if (!autoSize) return undefined;
+
+    // Calculate the number of characters to show (dynamic based on user input)
+    // Uses the min/max char length as a max, then add an extra UX buffer of 1
+    const maxChars = Math.max(String(min).length, String(max).length) + 1;
+    const inputCharWidth = Math.min(String(value).length, maxChars);
+
+    // Calculate the form padding based on `compressed` state
+    const { controlPadding, controlCompressedPadding } = euiFormVariables(
+      euiTheme
+    );
+    const inputPadding = compressed ? controlCompressedPadding : controlPadding;
+
+    // Calculate the invalid icon (if being displayed), also based on `compressed` state
+    const invalidIconWidth = hasInvalidIcon
+      ? euiTheme.euiTheme.base * (compressed ? 1.125 : 1.375) // TODO: DRY this out once EuiFormControlLayoutIcons is converted to Emotion
+      : 0;
+
+    // Guesstimate a width for the stepper. Note that it's a little wider in FF than it is in Chrome
+    const stepperWidth = 2;
+
+    return logicalStyles({
+      width: `calc(${inputPadding} + ${inputCharWidth}ch + ${stepperWidth}em + ${invalidIconWidth}px)`,
+    });
+  }, [autoSize, euiTheme, compressed, hasInvalidIcon, min, max, value]);
+
   return (
     <EuiFieldNumber
       name={name}
@@ -60,6 +97,8 @@ export const EuiRangeInput: FunctionComponent<EuiRangeInputProps> = ({
       max={Number(max)}
       step={step}
       value={value === '' ? '' : Number(value)}
+      inputRef={setRefs}
+      isInvalid={isInvalid}
       disabled={disabled}
       compressed={compressed}
       onChange={onChange}
diff --git a/src/components/form/validatable_control/validatable_control.test.tsx b/src/components/form/validatable_control/validatable_control.test.tsx
index 494adb72575..0c1972d461c 100644
--- a/src/components/form/validatable_control/validatable_control.test.tsx
+++ b/src/components/form/validatable_control/validatable_control.test.tsx
@@ -26,6 +26,20 @@ describe('EuiValidatableControl', () => {
     expect(component).toMatchSnapshot();
   });
 
+  test('aria-invalid allows falling back to prop set on the child input', () => {
+    const component = render(
+      <EuiValidatableControl>
+        <input aria-invalid={true} />
+      </EuiValidatableControl>
+    );
+
+    expect(component).toMatchInlineSnapshot(`
+      <input
+        aria-invalid="true"
+      />
+    `);
+  });
+
   describe('ref management', () => {
     it('calls a ref function', () => {
       const ref = jest.fn();
diff --git a/src/components/form/validatable_control/validatable_control.tsx b/src/components/form/validatable_control/validatable_control.tsx
index d8439747a9b..1ae8932911f 100644
--- a/src/components/form/validatable_control/validatable_control.tsx
+++ b/src/components/form/validatable_control/validatable_control.tsx
@@ -68,7 +68,7 @@ export const EuiValidatableControl: FunctionComponent<
 
   return cloneElement(child, {
     ref: replacedRef,
-    'aria-invalid': isInvalid,
+    'aria-invalid': isInvalid || child.props['aria-invalid'],
   });
 };
 
diff --git a/upcoming_changelogs/6704.md b/upcoming_changelogs/6704.md
new file mode 100644
index 00000000000..3af1488d1bd
--- /dev/null
+++ b/upcoming_changelogs/6704.md
@@ -0,0 +1,3 @@
+- Updated `EuiFieldNumber` to detect native browser invalid state and show an invalid icon
+- Improved the input widths of `EuiRange` and `EuiDualRange` when `showInput={true}` to account for invalid icons
+- Improved the `isInvalid` styling of `EuiDualRange` when `showInput="inputWithPopover"`