diff --git a/dlls/mfplat/mediatype.c b/dlls/mfplat/mediatype.c
index 69b302ca89e..6b67f5b33cc 100644
--- a/dlls/mfplat/mediatype.c
+++ b/dlls/mfplat/mediatype.c
@@ -1737,10 +1737,7 @@ static int __cdecl uncompressed_video_format_compare(const void *a, const void *
     return memcmp(guid, format->subtype, sizeof(*guid));
 }
 
-/***********************************************************************
- *      MFCalculateImageSize (mfplat.@)
- */
-HRESULT WINAPI MFCalculateImageSize(REFGUID subtype, UINT32 width, UINT32 height, UINT32 *size)
+static HRESULT mf_get_image_size(REFGUID subtype, unsigned int width, unsigned int height, unsigned int *size)
 {
     static const struct uncompressed_video_format video_formats[] =
     {
@@ -1755,8 +1752,6 @@ HRESULT WINAPI MFCalculateImageSize(REFGUID subtype, UINT32 width, UINT32 height
     };
     struct uncompressed_video_format *format;
 
-    TRACE("%s, %u, %u, %p.\n", debugstr_mf_guid(subtype), width, height, size);
-
     format = bsearch(subtype, video_formats, ARRAY_SIZE(video_formats), sizeof(*video_formats),
             uncompressed_video_format_compare);
     if (format)
@@ -1771,6 +1766,31 @@ HRESULT WINAPI MFCalculateImageSize(REFGUID subtype, UINT32 width, UINT32 height
     return format ? S_OK : E_INVALIDARG;
 }
 
+/***********************************************************************
+ *      MFCalculateImageSize (mfplat.@)
+ */
+HRESULT WINAPI MFCalculateImageSize(REFGUID subtype, UINT32 width, UINT32 height, UINT32 *size)
+{
+    TRACE("%s, %u, %u, %p.\n", debugstr_mf_guid(subtype), width, height, size);
+
+    return mf_get_image_size(subtype, width, height, size);
+}
+
+/***********************************************************************
+ *      MFGetPlaneSize (mfplat.@)
+ */
+HRESULT WINAPI MFGetPlaneSize(DWORD format, DWORD width, DWORD height, DWORD *size)
+{
+    GUID subtype;
+
+    TRACE("%#x, %u, %u, %p.\n", format, width, height, size);
+
+    memcpy(&subtype, &MFVideoFormat_Base, sizeof(subtype));
+    subtype.Data1 = format;
+
+    return mf_get_image_size(&subtype, width, height, size);
+}
+
 /***********************************************************************
  *      MFCompareFullToPartialMediaType (mfplat.@)
  */
diff --git a/dlls/mfplat/mfplat.spec b/dlls/mfplat/mfplat.spec
index 7e3bd4571c3..1e11a1fc2ab 100644
--- a/dlls/mfplat/mfplat.spec
+++ b/dlls/mfplat/mfplat.spec
@@ -96,7 +96,7 @@
 @ stub MFGetConfigurationString
 @ stub MFGetMFTMerit
 @ stub MFGetNumericNameFromSockaddr
-@ stub MFGetPlaneSize
+@ stdcall MFGetPlaneSize(long long long ptr)
 @ stub MFGetPlatform
 @ stdcall MFGetPluginControl(ptr)
 @ stub MFGetPrivateWorkqueues
diff --git a/dlls/mfplat/tests/mfplat.c b/dlls/mfplat/tests/mfplat.c
index a93bbfe7f1a..36fe9dc8319 100644
--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -91,6 +91,7 @@ static HRESULT (WINAPI *pMFTUnregisterLocalByCLSID)(CLSID clsid);
 static HRESULT (WINAPI *pMFAllocateWorkQueueEx)(MFASYNC_WORKQUEUE_TYPE queue_type, DWORD *queue);
 static HRESULT (WINAPI *pMFTEnumEx)(GUID category, UINT32 flags, const MFT_REGISTER_TYPE_INFO *input_type,
         const MFT_REGISTER_TYPE_INFO *output_type, IMFActivate ***activate, UINT32 *count);
+static HRESULT (WINAPI *pMFGetPlaneSize)(DWORD format, DWORD width, DWORD height, DWORD *size);
 
 static const WCHAR fileschemeW[] = L"file://";
 
@@ -662,6 +663,7 @@ static void init_functions(void)
     X(MFCreateSourceResolver);
     X(MFCreateMFByteStreamOnStream);
     X(MFCreateTransformActivate);
+    X(MFGetPlaneSize);
     X(MFHeapAlloc);
     X(MFHeapFree);
     X(MFPutWaitingWorkItem);
@@ -3184,6 +3186,9 @@ static void test_MFCalculateImageSize(void)
     UINT32 size;
     HRESULT hr;
 
+    if (!pMFGetPlaneSize)
+        win_skip("MFGetPlaneSize() is not available.\n");
+
     size = 1;
     hr = MFCalculateImageSize(&IID_IUnknown, 1, 1, &size);
     ok(hr == E_INVALIDARG || broken(hr == S_OK) /* Vista */, "Unexpected hr %#x.\n", hr);
@@ -3200,6 +3205,15 @@ static void test_MFCalculateImageSize(void)
         ok(hr == S_OK || (is_broken && hr == E_INVALIDARG), "%u: failed to calculate image size, hr %#x.\n", i, hr);
         ok(size == image_size_tests[i].size, "%u: unexpected image size %u, expected %u.\n", i, size,
             image_size_tests[i].size);
+
+        if (pMFGetPlaneSize)
+        {
+            hr = pMFGetPlaneSize(image_size_tests[i].subtype->Data1, image_size_tests[i].width, image_size_tests[i].height,
+                    &size);
+            ok(hr == S_OK, "%u: failed to get plane size, hr %#x.\n", i, hr);
+            ok(size == image_size_tests[i].size, "%u: unexpected plane size %u, expected %u.\n", i, size,
+                    image_size_tests[i].size);
+        }
     }
 }
 
diff --git a/include/mfapi.h b/include/mfapi.h
index 6636057daa2..38577cfe623 100644
--- a/include/mfapi.h
+++ b/include/mfapi.h
@@ -421,6 +421,7 @@ void *  WINAPI MFHeapAlloc(SIZE_T size, ULONG flags, char *file, int line, EAllo
 void    WINAPI MFHeapFree(void *ptr);
 HRESULT WINAPI MFGetAttributesAsBlob(IMFAttributes *attributes, UINT8 *buffer, UINT size);
 HRESULT WINAPI MFGetAttributesAsBlobSize(IMFAttributes *attributes, UINT32 *size);
+HRESULT WINAPI MFGetPlaneSize(DWORD format, DWORD width, DWORD height, DWORD *size);
 HRESULT WINAPI MFGetTimerPeriodicity(DWORD *periodicity);
 HRESULT WINAPI MFTEnum(GUID category, UINT32 flags, MFT_REGISTER_TYPE_INFO *input_type,
                        MFT_REGISTER_TYPE_INFO *output_type, IMFAttributes *attributes,