diff --git a/frontend/ui/data/optionsutil.lua b/frontend/ui/data/optionsutil.lua
index 7ca4bbada..0f4348cc3 100644
--- a/frontend/ui/data/optionsutil.lua
+++ b/frontend/ui/data/optionsutil.lua
@@ -63,7 +63,14 @@ function optionsutil.formatFlexSize(value, unit)
         -- We don't so subpixel positioning ;)
         fmt = "%d (%d %s)"
     end
-    return string.format(fmt, size, convertSizeTo(size, unit), shown_unit)
+
+    if G_reader_settings:isTrue("dimension_units_append_px") and unit ~= "px" then
+        local px_str = C_("Pixels", "px")
+        return string.format(fmt .. " [%d %s]", size, convertSizeTo(size, unit), shown_unit,
+                                                      convertSizeTo(size, "px"), px_str)
+    else
+        return string.format(fmt, size, convertSizeTo(size, unit), shown_unit)
+    end
 end
 
 function optionsutil.showValues(configurable, option, prefix, document, unit)
diff --git a/frontend/ui/elements/common_settings_menu_table.lua b/frontend/ui/elements/common_settings_menu_table.lua
index a392501c7..3df123cf9 100644
--- a/frontend/ui/elements/common_settings_menu_table.lua
+++ b/frontend/ui/elements/common_settings_menu_table.lua
@@ -721,6 +721,19 @@ common_settings.units = {
         return T(_("Dimension units: %1"), unit)
     end,
     sub_item_table = {
+        {
+            text = _("Also show values in pixels"),
+            checked_func = function()
+                return G_reader_settings:isTrue("dimension_units_append_px")
+            end,
+            enabled_func = function()
+                return G_reader_settings:readSetting("dimension_units") ~= "px"
+            end,
+            callback = function()
+                G_reader_settings:flipNilOrFalse("dimension_units_append_px")
+            end,
+            separator = true,
+        },
         genGenericMenuEntry(_("Metric system"),   "dimension_units", "mm", nil, true),
         genGenericMenuEntry(_("Imperial system"), "dimension_units", "in", nil, true),
         genGenericMenuEntry(_("Pixels"),          "dimension_units", "px", nil, true),