diff --git a/imgui_demo.cpp b/imgui_demo.cpp
index b8f4478e..b503146c 100644
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@@ -1752,7 +1752,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
                 ImGui::SameLine(); ShowHelpMarker("Note than the default embedded font is NOT meant to be scaled.\n\nFont are currently rendered into bitmaps at a given size at the time of building the atlas. You may oversample them to get some flexibility with scaling. You can also render at multiple sizes and select which one to use at runtime.\n\n(Glimmer of hope: the atlas system should hopefully be rewritten in the future to make scaling more natural and automatic.)");
                 ImGui::Text("Ascent: %f, Descent: %f, Height: %f", font->Ascent, font->Descent, font->Ascent - font->Descent);
                 ImGui::Text("Fallback character: '%c' (%d)", font->FallbackChar, font->FallbackChar);
-                ImGui::Text("Texture surface: %d pixels (approx)", font->MetricsTotalSurface);
+                ImGui::Text("Texture surface: %d pixels (approx) ~ %dx%d", font->MetricsTotalSurface, (int)sqrtf((int)font->MetricsTotalSurface), (int)sqrtf((int)font->MetricsTotalSurface));
                 for (int config_i = 0; config_i < font->ConfigDataCount; config_i++)
                 {
                     ImFontConfig* cfg = &font->ConfigData[config_i];
diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 87b60c7d..fa7cac52 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -1456,7 +1456,7 @@ bool    ImFontAtlas::Build()
                 glyph.XAdvance = (pc.xadvance + cfg.GlyphExtraSpacing.x);  // Bake spacing into XAdvance
                 if (cfg.PixelSnapH)
                     glyph.XAdvance = (float)(int)(glyph.XAdvance + 0.5f);
-                dst_font->MetricsTotalSurface += (int)(glyph.X1 - glyph.X0 + 1.99f) * (int)(glyph.Y1 - glyph.Y0 + 1.99f); // +1 to account for average padding, +0.99 to round
+                dst_font->MetricsTotalSurface += (int)((glyph.U1 - glyph.U0) * TexWidth + 1.99f) * (int)((glyph.V1 - glyph.V0) * TexHeight + 1.99f); // +1 to account for average padding, +0.99 to round
             }
         }
         cfg.DstFont->BuildLookupTable();