diff --git a/src/libsysprof-ui/sysprof-zoom-manager.c b/src/libsysprof-ui/sysprof-zoom-manager.c
index ed7b0456..cdb0665e 100644
--- a/src/libsysprof-ui/sysprof-zoom-manager.c
+++ b/src/libsysprof-ui/sysprof-zoom-manager.c
@@ -27,6 +27,9 @@
 
 #include "sysprof-zoom-manager.h"
 
+#define DEFAULT_PIXELS_PER_SEC (20.0)
+#define NSEC_PER_SEC G_GINT64_CONSTANT(1000000000)
+
 struct _SysprofZoomManager
 {
   GObject parent_instance;
@@ -56,21 +59,9 @@ G_DEFINE_TYPE_EXTENDED (SysprofZoomManager, sysprof_zoom_manager, G_TYPE_OBJECT,
 
 static GParamSpec *properties [N_PROPS];
 static gdouble zoom_levels[] = {
-  0.3,
-  0.5,
-  0.67,
-  0.80,
-  0.90,
-  1.0,
-  1.5,
-  2.0,
-  2.5,
-  3.0,
-  5.0,
-  10.0,
-  20.0,
-  30.0,
-  50.0,
+  0.3, 0.5, 0.67, 0.80, 0.90,
+  1.0, 1.5, 2.0, 2.5, 3.0,
+  5.0, 10.0, 20.0, 30.0, 50.0,
 };
 
 static void
@@ -506,3 +497,21 @@ sysprof_zoom_manager_get_zoom_label (SysprofZoomManager *self)
   else
     return g_strdup_printf ("%d%%", (gint)percent);
 }
+
+gint64
+sysprof_zoom_manager_get_duration_for_width (SysprofZoomManager *self,
+                                             gint                width)
+{
+  g_return_val_if_fail (SYSPROF_IS_ZOOM_MANAGER (self), 0);
+
+  return NSEC_PER_SEC * ((gdouble)width / (DEFAULT_PIXELS_PER_SEC * self->zoom));
+}
+
+gint
+sysprof_zoom_manager_get_width_for_duration (SysprofZoomManager *self,
+                                             gint64              duration)
+{
+  g_return_val_if_fail (SYSPROF_IS_ZOOM_MANAGER (self), 0);
+
+  return (gdouble)duration / (gdouble)NSEC_PER_SEC * DEFAULT_PIXELS_PER_SEC * self->zoom;
+}
diff --git a/src/libsysprof-ui/sysprof-zoom-manager.h b/src/libsysprof-ui/sysprof-zoom-manager.h
index 62aa45e6..4c7859b7 100644
--- a/src/libsysprof-ui/sysprof-zoom-manager.h
+++ b/src/libsysprof-ui/sysprof-zoom-manager.h
@@ -64,5 +64,11 @@ void                sysprof_zoom_manager_set_zoom         (SysprofZoomManager *s
                                                            gdouble             zoom);
 SYSPROF_AVAILABLE_IN_ALL
 gchar              *sysprof_zoom_manager_get_zoom_label   (SysprofZoomManager *self);
+SYSPROF_AVAILABLE_IN_ALL
+gint                sysprof_zoom_manager_get_width_for_duration (SysprofZoomManager *self,
+                                                                 gint64              duration);
+SYSPROF_AVAILABLE_IN_ALL
+gint64              sysprof_zoom_manager_get_duration_for_width (SysprofZoomManager *self,
+                                                                 gint                width);
 
 G_END_DECLS