diff --git a/Test/Unit/Aggregator/Store/WebsiteCountAggregatorTest.php b/Test/Unit/Aggregator/Store/WebsiteCountAggregatorTest.php
new file mode 100644
index 0000000..1f6bdf1
--- /dev/null
+++ b/Test/Unit/Aggregator/Store/WebsiteCountAggregatorTest.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace RunAsRoot\PrometheusExporter\Test\Unit\Aggregator\Store;
+
+use Magento\Store\Api\WebsiteRepositoryInterface;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use RunAsRoot\PrometheusExporter\Aggregator\Store\WebsiteCountAggregator;
+use RunAsRoot\PrometheusExporter\Service\UpdateMetricService;
+
+final class WebsiteCountAggregatorTest extends TestCase
+{
+    private const METRIC_CODE = 'magento_website_count_total';
+
+    private WebsiteCountAggregator $sut;
+
+    /** @var MockObject|UpdateMetricService */
+    private $updateMetricService;
+
+    /** @var MockObject|WebsiteRepositoryInterface */
+    private $websiteRepository;
+
+    protected function setUp(): void
+    {
+        $this->updateMetricService = $this->createMock(UpdateMetricService::class);
+        $this->websiteRepository = $this->createMock(WebsiteRepositoryInterface::class);
+
+        $this->sut = new WebsiteCountAggregator(
+            $this->updateMetricService,
+            $this->websiteRepository
+        );
+    }
+
+    public function testAggregate(): void
+    {
+        $this->websiteRepository
+            ->expects($this->once())
+            ->method('getList')
+            ->willReturn(['a', 'b', 'c', 'd', '3']);
+
+        $this->updateMetricService
+            ->expects($this->once())
+            ->method('update')
+            ->with(self::METRIC_CODE, '5');
+
+        $this->sut->aggregate();
+    }
+}
diff --git a/src/Aggregator/Store/WebsiteCountAggregator.php b/src/Aggregator/Store/WebsiteCountAggregator.php
new file mode 100644
index 0000000..2935b1c
--- /dev/null
+++ b/src/Aggregator/Store/WebsiteCountAggregator.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace RunAsRoot\PrometheusExporter\Aggregator\Store;
+
+use Magento\Store\Api\StoreRepositoryInterface;
+use Magento\Store\Api\WebsiteRepositoryInterface;
+use RunAsRoot\PrometheusExporter\Api\MetricAggregatorInterface;
+use RunAsRoot\PrometheusExporter\Service\UpdateMetricService;
+
+class WebsiteCountAggregator implements MetricAggregatorInterface
+{
+    private const METRIC_CODE = 'magento_website_count_total';
+
+    private UpdateMetricService $updateMetricService;
+
+    private WebsiteRepositoryInterface $websiteRepository;
+
+    /**
+     * @param UpdateMetricService $updateMetricService
+     * @param WebsiteRepositoryInterface $websiteRepository
+     */
+    public function __construct(
+        UpdateMetricService $updateMetricService,
+        WebsiteRepositoryInterface $websiteRepository
+    ) {
+        $this->updateMetricService = $updateMetricService;
+        $this->websiteRepository = $websiteRepository;
+    }
+
+    public function getCode(): string
+    {
+        return self::METRIC_CODE;
+    }
+
+    public function getHelp(): string
+    {
+        return 'Magento 2 Website Count.';
+    }
+
+    public function getType(): string
+    {
+        return 'gauge';
+    }
+
+    public function aggregate(): bool
+    {
+        $websiteList = $this->websiteRepository->getList();
+        $websiteCount = (string)count($websiteList);
+
+        return $this->updateMetricService->update(self::METRIC_CODE, $websiteCount);
+    }
+}
diff --git a/src/etc/di.xml b/src/etc/di.xml
index 79af7f5..3664098 100644
--- a/src/etc/di.xml
+++ b/src/etc/di.xml
@@ -53,6 +53,7 @@
 
                 <!-- Store Aggregator -->
                 <item name="StoreCountAggregator" xsi:type="object">RunAsRoot\PrometheusExporter\Aggregator\Store\StoreCountAggregator</item>
+                <item name="WebsiteCountAggregator" xsi:type="object">RunAsRoot\PrometheusExporter\Aggregator\Store\WebsiteCountAggregator</item>
 
                 <!-- User Aggregator -->
                 <item name="AdminUserCountAggregator" xsi:type="object">RunAsRoot\PrometheusExporter\Aggregator\User\AdminUserCountAggregator</item>