diff --git a/gtk/gtkstylecontext.c b/gtk/gtkstylecontext.c
index 370c782055..c4669eb586 100644
--- a/gtk/gtkstylecontext.c
+++ b/gtk/gtkstylecontext.c
@@ -2372,6 +2372,22 @@ _gtk_style_context_peek_property (GtkStyleContext *context,
   return _gtk_css_computed_values_get_value_by_name (data->store, property_name);
 }
 
+double
+_gtk_style_context_get_number (GtkStyleContext *context,
+                               const char      *property_name,
+                               double           one_hundred_percent)
+{
+  const GValue *value;
+  const GtkCssNumber *number;
+  
+  value = _gtk_style_context_peek_property (context, property_name);
+  number = g_value_get_boxed (value);
+  if (number->unit == GTK_CSS_PERCENT)
+    return number->value * one_hundred_percent * 0.01;
+  else
+    return number->value;
+}
+
 const GValue *
 _gtk_style_context_peek_style_property (GtkStyleContext *context,
                                         GType            widget_type,
diff --git a/gtk/gtkstylecontextprivate.h b/gtk/gtkstylecontextprivate.h
index ffde8db52e..59a8a698ca 100644
--- a/gtk/gtkstylecontextprivate.h
+++ b/gtk/gtkstylecontextprivate.h
@@ -27,6 +27,9 @@ G_BEGIN_DECLS
 
 const GValue * _gtk_style_context_peek_property              (GtkStyleContext *context,
                                                               const char      *property_name);
+double         _gtk_style_context_get_number                 (GtkStyleContext *context,
+                                                              const char      *property_name,
+                                                              double           one_hundred_percent);
 const GValue * _gtk_style_context_peek_style_property        (GtkStyleContext *context,
                                                               GType            widget_type,
                                                               GtkStateFlags    state,
diff --git a/gtk/gtkthemingengine.c b/gtk/gtkthemingengine.c
index bac1f72301..ce90769ed6 100644
--- a/gtk/gtkthemingengine.c
+++ b/gtk/gtkthemingengine.c
@@ -340,6 +340,17 @@ _gtk_theming_engine_peek_property (GtkThemingEngine *engine,
   return _gtk_style_context_peek_property (engine->priv->context, property_name);
 }
 
+double
+_gtk_theming_engine_get_number (GtkThemingEngine *engine,
+                                const char       *property_name,
+                                double            one_hundred_percent)
+{
+  g_return_val_if_fail (GTK_IS_THEMING_ENGINE (engine), 0.0);
+  g_return_val_if_fail (property_name != NULL, 0.0);
+
+  return _gtk_style_context_get_number (engine->priv->context, property_name, one_hundred_percent);
+}
+
 /**
  * gtk_theming_engine_get_property:
  * @engine: a #GtkThemingEngine
diff --git a/gtk/gtkthemingengineprivate.h b/gtk/gtkthemingengineprivate.h
index 3cb20d82c3..10db6f7470 100644
--- a/gtk/gtkthemingengineprivate.h
+++ b/gtk/gtkthemingengineprivate.h
@@ -30,5 +30,8 @@ void _gtk_theming_engine_paint_spinner (cairo_t *cr,
 
 const GValue *_gtk_theming_engine_peek_property (GtkThemingEngine *engine,
                                                  const char       *property_name);
+double        _gtk_theming_engine_get_number    (GtkThemingEngine *engine,
+                                                 const char       *property_name,
+                                                 double            one_hundred_percent);
 
 #endif /* __GTK_THEMING_ENGINE_PRIVATE_H__ */