diff --git a/backends/imgui_impl_emscripten.cpp b/backends/imgui_impl_emscripten.cpp
index 52f24cd0c..a6c358d08 100644
--- a/backends/imgui_impl_emscripten.cpp
+++ b/backends/imgui_impl_emscripten.cpp
@@ -4,6 +4,7 @@
 //
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2026-09-06: Emscripten: Added ImGui_ImplEmscripten_GetCssToImGuiScale() helper.
 //  2026-09-05: Emscripten: Use the canvas framebuffer dimensions for display sizing and exact per-axis mouse coordinate scaling.
 //  2026-09-04: Emscripten: Replaced TargetDevicePixelRatio global with an Init() parameter and runtime setter.
 //  2026-09-03: Updated coding style and simplified key translation table setup.
@@ -402,6 +403,13 @@ void ImGui_ImplEmscripten_SetTargetDevicePixelRatio(float target_device_pixel_ra
     ImGui_ImplEmscripten_UpdateDisplayProperties(ImGui::GetIO(), bd);
 }
 
+ImVec2 ImGui_ImplEmscripten_GetCssToImGuiScale()
+{
+    ImGui_ImplEmscripten_Data* bd = ImGui_ImplEmscripten_GetBackendData();
+    IM_ASSERT(bd != nullptr && "Context or backend not initialized? Did you call ImGui_ImplEmscripten_Init()?");
+    return bd != nullptr ? bd->CssToImGuiScale : ImVec2(1.0f, 1.0f);
+}
+
 void ImGui_ImplEmscripten_Shutdown()
 {
     ImGui_ImplEmscripten_Data* bd = ImGui_ImplEmscripten_GetBackendData();
diff --git a/backends/imgui_impl_emscripten.h b/backends/imgui_impl_emscripten.h
index c81e867f3..357017517 100644
--- a/backends/imgui_impl_emscripten.h
+++ b/backends/imgui_impl_emscripten.h
@@ -47,6 +47,9 @@ IMGUI_IMPL_API bool ImGui_ImplEmscripten_Init(float target_device_pixel_ratio =
 // Change the target device pixel ratio at runtime and update display properties immediately.
 IMGUI_IMPL_API void ImGui_ImplEmscripten_SetTargetDevicePixelRatio(float target_device_pixel_ratio);
 
+// Return the scale used to convert browser CSS pixel coordinates to Dear ImGui coordinates. Valid after Init().
+IMGUI_IMPL_API ImVec2 ImGui_ImplEmscripten_GetCssToImGuiScale();
+
 // Shut down the Emscripten backend.  This unsets all Emscripten input callbacks set by Init.
 // Note it'll also unset any Emscripten input callbacks set elsewhere in the program!
 // Note also there is no obligation to ever call this, unless you intend to reset the backend (i.e. with ImGui::DestroyContext()).