diff --git a/filetree/node.go b/filetree/node.go
index fff164c..71507ed 100644
--- a/filetree/node.go
+++ b/filetree/node.go
@@ -123,7 +123,25 @@ func (node *FileNode) MetadataString() string {
 	user := node.Data.FileInfo.TarHeader.Uid
 	group := node.Data.FileInfo.TarHeader.Gid
 	userGroup := fmt.Sprintf("%d:%d", user, group)
-	size := humanize.Bytes(uint64(node.Data.FileInfo.TarHeader.FileInfo().Size()))
+
+	//size := humanize.Bytes(uint64(node.Data.FileInfo.TarHeader.FileInfo().Size()))
+	var sizeBytes int64
+
+	if node.Data.FileInfo.TarHeader.FileInfo().IsDir() {
+
+		sizer := func(curNode *FileNode) error {
+			if curNode.Data.DiffType != Removed {
+				sizeBytes += curNode.Data.FileInfo.TarHeader.FileInfo().Size()
+			}
+			return nil
+		}
+
+		node.VisitDepthChildFirst(sizer, nil)
+	} else {
+		sizeBytes = node.Data.FileInfo.TarHeader.FileInfo().Size()
+	}
+
+	size := humanize.Bytes(uint64(sizeBytes))
 
 	return style.Sprint(fmt.Sprintf(AttributeFormat, dir, fileMode, userGroup, size))
 }
diff --git a/filetree/tree.go b/filetree/tree.go
index 3b05571..155df5b 100644
--- a/filetree/tree.go
+++ b/filetree/tree.go
@@ -149,7 +149,6 @@ func (tree *FileTree) GetNode(path string) (*FileNode, error) {
 }
 
 func (tree *FileTree) AddPath(path string, data FileInfo) (*FileNode, error) {
-	// fmt.Printf("ADDPATH: %s %+v\n", path, data)
 	nodeNames := strings.Split(strings.Trim(path, "/"), "/")
 	node := tree.Root
 	for idx, name := range nodeNames {
@@ -193,14 +192,12 @@ func (tree *FileTree) Compare(upper *FileTree) error {
 			lowerNode, _ := tree.GetNode(upperNode.Path())
 			if lowerNode == nil {
 				newNode, err := tree.AddPath(upperNode.Path(), upperNode.Data.FileInfo)
-				// fmt.Printf("added new upperNode at %s\n", newNode.Path())
 				if err != nil {
 					return fmt.Errorf("cannot add new upperNode %s: %v", upperNode.Path(), err.Error())
 				}
 				newNode.AssignDiffType(Added)
 			} else {
 				diffType := lowerNode.compare(upperNode)
-				// fmt.Printf("found existing upperNode at %s\n", lowerNode.Path())
 				return lowerNode.deriveDiffType(diffType)
 			}
 		}
diff --git a/image/image.go b/image/image.go
index f46fd0a..6560d49 100644
--- a/image/image.go
+++ b/image/image.go
@@ -17,10 +17,11 @@ import (
 	humanize "github.com/dustin/go-humanize"
 	"github.com/wagoodman/docker-image-explorer/filetree"
 	"golang.org/x/net/context"
+	"strconv"
 )
 
 const (
-	LayerFormat = "%-25s %7s %s"
+	LayerFormat = "%-25s %5s %7s %s"
 )
 
 func check(e error) {
@@ -51,8 +52,11 @@ func NewManifest(reader *tar.Reader, header *tar.Header) ImageManifest {
 }
 
 type Layer struct {
-	TarPath string
-	History types.ImageHistory
+	TarPath  string
+	History  types.ImageHistory
+	Index    int
+	Tree     *filetree.FileTree
+	RefTrees []*filetree.FileTree
 }
 
 func (layer *Layer) Id() string {
@@ -69,7 +73,12 @@ func (layer *Layer) Id() string {
 
 func (layer *Layer) String() string {
 
-	return fmt.Sprintf(LayerFormat, layer.Id(), humanize.Bytes(uint64(layer.History.Size)), strings.TrimPrefix(layer.History.CreatedBy, "/bin/sh -c "))
+	return fmt.Sprintf(LayerFormat,
+						layer.Id(),
+						strconv.Itoa(int(100.0*filetree.EfficiencyScore(layer.RefTrees[:layer.Index+1]))) + "%",
+						//"100%",
+						humanize.Bytes(uint64(layer.History.Size)),
+						strings.TrimPrefix(layer.History.CreatedBy, "/bin/sh -c "))
 }
 
 func InitializeData(imageID string) ([]*Layer, []*filetree.FileTree) {
@@ -144,6 +153,9 @@ func InitializeData(imageID string) ([]*Layer, []*filetree.FileTree) {
 	for idx := 0; idx < len(layers); idx++ {
 		layers[idx] = new(Layer)
 		layers[idx].History = history[idx]
+		layers[idx].Index = idx
+		layers[idx].Tree = trees[idx]
+		layers[idx].RefTrees = trees
 		if len(manifest.LayerTarPaths) > idx {
 			layers[idx].TarPath = manifest.LayerTarPaths[idx]
 		}
diff --git a/ui/filetreeview.go b/ui/filetreeview.go
index fdd0918..49c80ee 100644
--- a/ui/filetreeview.go
+++ b/ui/filetreeview.go
@@ -242,7 +242,7 @@ func (view *FileTreeView) Update() error {
 		}
 		return nil
 	}, nil)
-	return nil;
+	return nil
 }
 
 func (view *FileTreeView) KeyHelp() string {
diff --git a/ui/layerview.go b/ui/layerview.go
index fbc8355..b4558a3 100644
--- a/ui/layerview.go
+++ b/ui/layerview.go
@@ -133,7 +133,7 @@ func (view *LayerView) Update() error {
 func (view *LayerView) Render() error {
 	view.gui.Update(func(g *gocui.Gui) error {
 		// update header
-		headerStr := fmt.Sprintf("Cmp "+image.LayerFormat, "Image ID", "Size", "Filter")
+		headerStr := fmt.Sprintf("Cmp "+image.LayerFormat, "Image ID", "%Eff.", "Size", "Filter")
 		fmt.Fprintln(view.header, Formatting.Header(vtclean.Clean(headerStr, false)))
 
 		// update contents
@@ -145,7 +145,7 @@ func (view *LayerView) Render() error {
 			layerStr := layer.String()
 			if idx == 0 {
 				// TODO: add size
-				layerStr = fmt.Sprintf(image.LayerFormat, layer.History.ID[0:25], "", "FROM "+layer.Id())
+				layerStr = fmt.Sprintf(image.LayerFormat, layer.History.ID[0:25], "", "", "FROM "+layer.Id())
 			}
 
 			compareBar := view.renderCompareBar(idx)