diff --git a/SDWebImage/Core/UIImage+MemoryCacheCost.m b/SDWebImage/Core/UIImage+MemoryCacheCost.m
index b0883b1f..4cf80bf8 100644
--- a/SDWebImage/Core/UIImage+MemoryCacheCost.m
+++ b/SDWebImage/Core/UIImage+MemoryCacheCost.m
@@ -20,7 +20,8 @@ FOUNDATION_STATIC_INLINE NSUInteger SDMemoryCacheCostForImage(UIImage *image) {
 #if SD_MAC
     frameCount = 1;
 #elif SD_UIKIT || SD_WATCH
-    frameCount = image.images.count > 0 ? image.images.count : 1;
+    // Filter the same frame in `_UIAnimatedImage`.
+    frameCount = image.images.count > 0 ? [NSSet setWithArray:image.images].count : 1;
 #endif
     NSUInteger cost = bytesPerFrame * frameCount;
     return cost;
diff --git a/Tests/SDWebImage Tests.xcodeproj/project.pbxproj b/Tests/SDWebImage Tests.xcodeproj/project.pbxproj
index b9c1fda2..21c374b0 100644
--- a/Tests/SDWebImage Tests.xcodeproj/project.pbxproj	
+++ b/Tests/SDWebImage Tests.xcodeproj/project.pbxproj	
@@ -104,6 +104,7 @@
 		4369C2741D9804B1007E863A /* SDWebCacheCategoriesTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 4369C2731D9804B1007E863A /* SDWebCacheCategoriesTests.m */; };
 		43828A451DA67F9900000E62 /* TestImageLarge.jpg in Resources */ = {isa = PBXBuildFile; fileRef = 43828A441DA67F9900000E62 /* TestImageLarge.jpg */; };
 		5F7F38AD1AE2A77A00B0E330 /* TestImage.jpg in Resources */ = {isa = PBXBuildFile; fileRef = 5F7F38AC1AE2A77A00B0E330 /* TestImage.jpg */; };
+		6B181A1B265757ED00BD06B3 /* TestAnimatedImageMemory.webp in Resources */ = {isa = PBXBuildFile; fileRef = 6B181A1A265757ED00BD06B3 /* TestAnimatedImageMemory.webp */; };
 		770D3B9C7914D53EBA0524DB /* Pods_Tests_TV.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B73996BC299E8E0174661628 /* Pods_Tests_TV.framework */; };
 		AFDBD4044E95252B70FB85CE /* Pods_Tests_iOS.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = AD1BD830DA7388EB6C110B3B /* Pods_Tests_iOS.framework */; };
 		DA248D57195472AA00390AB0 /* XCTest.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = DA248D56195472AA00390AB0 /* XCTest.framework */; };
@@ -165,6 +166,7 @@
 		5B0011ED58CC9998E68ECCE3 /* Pods-Tests TV.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Tests TV.debug.xcconfig"; path = "../Pods/Target Support Files/Pods-Tests TV/Pods-Tests TV.debug.xcconfig"; sourceTree = "<group>"; };
 		5F7F38AC1AE2A77A00B0E330 /* TestImage.jpg */ = {isa = PBXFileReference; lastKnownFileType = image.jpeg; path = TestImage.jpg; sourceTree = "<group>"; };
 		6700DBD9C45B00AB5F77472A /* Pods-Tests.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Tests.release.xcconfig"; path = "../Pods/Target Support Files/Pods-Tests/Pods-Tests.release.xcconfig"; sourceTree = "<group>"; };
+		6B181A1A265757ED00BD06B3 /* TestAnimatedImageMemory.webp */ = {isa = PBXFileReference; lastKnownFileType = file; path = TestAnimatedImageMemory.webp; sourceTree = "<group>"; };
 		6CB13D7A081654B2E4018F53 /* Pods-Tests TV.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Tests TV.release.xcconfig"; path = "../Pods/Target Support Files/Pods-Tests TV/Pods-Tests TV.release.xcconfig"; sourceTree = "<group>"; };
 		A39EDFED1067C297B91792CB /* Pods_Tests_Mac.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_Tests_Mac.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		AD1BD830DA7388EB6C110B3B /* Pods_Tests_iOS.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_Tests_iOS.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -265,6 +267,7 @@
 				3297A09E23374D1600814590 /* TestImageAnimated.heic */,
 				32515F9824AF1919005E8F79 /* TestImageAnimated.webp */,
 				32515F9724AF1919005E8F79 /* TestImageStatic.webp */,
+				6B181A1A265757ED00BD06B3 /* TestAnimatedImageMemory.webp */,
 			);
 			path = Images;
 			sourceTree = "<group>";
@@ -511,6 +514,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				327A418C211D660600495442 /* TestImage.heic in Resources */,
+				6B181A1B265757ED00BD06B3 /* TestAnimatedImageMemory.webp in Resources */,
 				5F7F38AD1AE2A77A00B0E330 /* TestImage.jpg in Resources */,
 				32905E64211D786E00460FCF /* TestImage.heif in Resources */,
 				43828A451DA67F9900000E62 /* TestImageLarge.jpg in Resources */,
diff --git a/Tests/Tests/Images/TestAnimatedImageMemory.webp b/Tests/Tests/Images/TestAnimatedImageMemory.webp
new file mode 100644
index 00000000..0cd2f0ee
Binary files /dev/null and b/Tests/Tests/Images/TestAnimatedImageMemory.webp differ
diff --git a/Tests/Tests/SDAnimatedImageTest.m b/Tests/Tests/SDAnimatedImageTest.m
index ef082285..7d93b32a 100644
--- a/Tests/Tests/SDAnimatedImageTest.m
+++ b/Tests/Tests/SDAnimatedImageTest.m
@@ -713,7 +713,7 @@ static BOOL _isCalled;
     [self waitForExpectationsWithTimeout:15 handler:nil];
 }
 
-- (void)test35AnimatedImagePlaybackModeReversedBounce{
+- (void)test35AnimatedImagePlaybackModeReversedBounce {
     XCTestExpectation *expectation = [self expectationWithDescription:@"test SDAnimatedImageView playback reverse bounce mode"];
     
     SDAnimatedImageView *imageView = [SDAnimatedImageView new];
@@ -765,6 +765,18 @@ static BOOL _isCalled;
     [self waitForExpectationsWithTimeout:15 handler:nil];
 }
 
+- (void)test36AnimatedImageMemoryCost {
+    if (@available(iOS 14, tvOS 14, macOS 11, watchOS 7, *)) {
+        [[SDImageCodersManager sharedManager] addCoder:[SDImageAWebPCoder sharedCoder]];
+        UIImage *image = [UIImage sd_imageWithData:[NSData dataWithContentsOfFile:[self testMemotyCostImagePath]]];
+        NSUInteger cost = [image sd_memoryCost];
+        expect(image.images.count).equal(5333);
+        expect(image.scale).equal(1);
+        expect(cost).equal(16 * image.size.width * image.size.height * 4);
+        [[SDImageCodersManager sharedManager] removeCoder:[SDImageAWebPCoder sharedCoder]];
+    }
+}
+
 #pragma mark - Helper
 - (UIWindow *)window {
     if (!_window) {
@@ -795,6 +807,12 @@ static BOOL _isCalled;
     return testPath;
 }
 
+- (NSString *)testMemotyCostImagePath {
+    NSBundle *testBundle = [NSBundle bundleForClass:[self class]];
+    NSString *testPath = [testBundle pathForResource:@"TestAnimatedImageMemory" ofType:@"webp"];
+    return testPath;
+}
+
 - (NSData *)testAPNGPData {
     return [NSData dataWithContentsOfFile:[self testAPNGPPath]];
 }