diff --git a/layouts/grid.go b/layouts/grid.go
index 4943a72..5c423ff 100644
--- a/layouts/grid.go
+++ b/layouts/grid.go
@@ -106,15 +106,14 @@ func expand (hints tomo.LayoutHints, sizes []int, space int, expands func (int)
 }
 
 func ceilDiv (x, y int) int {
+	if y == 0 { return 0 }
 	return int(math.Ceil(float64(x) / float64(y)))
 }
 
 func (this *Grid) RecommendedHeight (hints tomo.LayoutHints, boxes []tomo.Box, width int) int {
-	// TODO
-	return 0
+	return this.MinimumSize(hints, boxes).Y
 }
 
 func (this *Grid) RecommendedWidth (hints tomo.LayoutHints, boxes []tomo.Box, height int) int {
-	// TODO
-	return 0
+	return this.MinimumSize(hints, boxes).X
 }