diff --git a/lib/API/JSON/v1/DynamicSegments.php b/lib/API/JSON/v1/DynamicSegments.php
index fffc4bf673..757f63ac6f 100644
--- a/lib/API/JSON/v1/DynamicSegments.php
+++ b/lib/API/JSON/v1/DynamicSegments.php
@@ -12,8 +12,10 @@ use MailPoet\Entities\SegmentEntity;
 use MailPoet\Listing\Handler;
 use MailPoet\Segments\DynamicSegments\DynamicSegmentsListingRepository;
 use MailPoet\Segments\DynamicSegments\Exceptions\InvalidFilterException;
+use MailPoet\Segments\DynamicSegments\FilterDataMapper;
 use MailPoet\Segments\DynamicSegments\SegmentSaveController;
 use MailPoet\Segments\SegmentsRepository;
+use MailPoet\Segments\SegmentSubscribersRepository;
 use MailPoet\UnexpectedValueException;
 use MailPoet\WP\Functions as WPFunctions;
 
@@ -38,11 +40,19 @@ class DynamicSegments extends APIEndpoint {
   /** @var SegmentSaveController */
   private $saveController;
 
+  /** @var SegmentSubscribersRepository */
+  private $segmentSubscribersRepository;
+
+  /** @var FilterDataMapper */
+  private $filterDataMapper;
+
   public function __construct(
     Handler $handler,
     DynamicSegmentsListingRepository $dynamicSegmentsListingRepository,
     DynamicSegmentsResponseBuilder $segmentsResponseBuilder,
     SegmentsRepository $segmentsRepository,
+    SegmentSubscribersRepository $segmentSubscribersRepository,
+    FilterDataMapper $filterDataMapper,
     SegmentSaveController $saveController
   ) {
     $this->listingHandler = $handler;
@@ -50,6 +60,8 @@ class DynamicSegments extends APIEndpoint {
     $this->segmentsResponseBuilder = $segmentsResponseBuilder;
     $this->segmentsRepository = $segmentsRepository;
     $this->saveController = $saveController;
+    $this->segmentSubscribersRepository = $segmentSubscribersRepository;
+    $this->filterDataMapper = $filterDataMapper;
   }
 
   public function get($data = []) {
@@ -71,6 +83,20 @@ class DynamicSegments extends APIEndpoint {
     return $this->successResponse($this->segmentsResponseBuilder->build($segment));
   }
 
+  public function getCount($data = []) {
+    try {
+      $filterData = $this->filterDataMapper->map($data);
+      $count = $this->segmentSubscribersRepository->getDynamicSubscribersCount($filterData);
+      return $this->successResponse([
+        'count' => $count,
+      ]);
+    } catch (InvalidFilterException $e) {
+      return $this->errorResponse([
+        Error::BAD_REQUEST => $this->getErrorString($e),
+      ], [], Response::STATUS_BAD_REQUEST);
+    }
+  }
+
   public function save($data) {
     try {
       $segment = $this->saveController->save($data);
diff --git a/lib/Segments/SegmentSubscribersRepository.php b/lib/Segments/SegmentSubscribersRepository.php
index dead42b1e8..cae534c078 100644
--- a/lib/Segments/SegmentSubscribersRepository.php
+++ b/lib/Segments/SegmentSubscribersRepository.php
@@ -2,6 +2,7 @@
 
 namespace MailPoet\Segments;
 
+use MailPoet\Entities\DynamicSegmentFilterData;
 use MailPoet\Entities\SegmentEntity;
 use MailPoet\Entities\SubscriberEntity;
 use MailPoet\Entities\SubscriberSegmentEntity;
@@ -85,6 +86,18 @@ class SegmentSubscribersRepository {
     return (int)$result;
   }
 
+  public function getDynamicSubscribersCount(DynamicSegmentFilterData $data): int {
+    $subscribersTable = $this->entityManager->getClassMetadata(SubscriberEntity::class)->getTableName();
+    $queryBuilder = $this->entityManager->getConnection()->createQueryBuilder();
+    $queryBuilder
+      ->select("COUNT(DISTINCT {$subscribersTable}.id) AS count")
+      ->from($subscribersTable, $subscribersTable);
+    $queryBuilder = $this->filterHandler->apply($queryBuilder, $data);
+    $statement = $this->executeQuery($queryBuilder);
+    $result = $statement->fetchColumn();
+    return (int)$result;
+  }
+
   public function getSubscribersWithoutSegmentCount(): int {
     $queryBuilder = $this->getSubscribersWithoutSegmentCountQuery();
     return (int)$queryBuilder->getQuery()->getSingleScalarResult();