diff --git a/src/utils/common-expression-helpers.ts b/src/utils/common-expression-helpers.ts
index e1bd6d27c..6ab438272 100644
--- a/src/utils/common-expression-helpers.ts
+++ b/src/utils/common-expression-helpers.ts
@@ -332,6 +332,24 @@ export class CommonExpressionHelpers {
     });
     return values;
   };
+
+  calcGravida(parityTerm: number, parityAbortion: number) {
+    let gravida = 0;
+    if(parityTerm && parityAbortion) {
+      gravida = parityTerm + parityAbortion + 1;
+    }
+
+    return gravida;
+  }
+
+  calcDaysSinceCircumcisionProcedure(val) {
+    let daySinceLastCircumcision = 0;
+    if(val) {
+      var timeDiff = Math.abs((new Date).getTime() - Date.parse(val));
+      daySinceLastCircumcision = Math.floor(timeDiff / (1000 * 60 * 60 * 24));
+    }
+    return daySinceLastCircumcision;
+  }
 }
 
 export function registerDependency(node: FormNode, determinant: OHRIFormField) {
diff --git a/src/utils/expression-runner.ts b/src/utils/expression-runner.ts
index efd336860..2632270f9 100644
--- a/src/utils/expression-runner.ts
+++ b/src/utils/expression-runner.ts
@@ -53,6 +53,8 @@ export function evaluateExpression(
     arrayContainsAny,
     formatDate,
     extractRepeatingGroupValues,
+    calcGravida,
+    calcDaysSinceCircumcisionProcedure
   } = new CommonExpressionHelpers(node, patient, allFields, allFieldValues, allFieldsKeys);
 
   parts.forEach((part, index) => {
@@ -108,6 +110,8 @@ export async function evaluateAsyncExpression(
     arrayContainsAny,
     formatDate,
     extractRepeatingGroupValues,
+    calcGravida,
+    calcDaysSinceCircumcisionProcedure,
   } = new CommonExpressionHelpers(node, patient, allFields, allFieldValues, allFieldsKeys);
 
   const lazyFragments = [];