diff --git a/container.go b/container.go
index 0aed60c..b6d61a8 100644
--- a/container.go
+++ b/container.go
@@ -45,7 +45,7 @@ func (c *Container) Collect(client *docker.Client) {
 		for s := range c.stats {
 			c.reader.Read(s)
 			c.widgets.SetCPU(c.reader.CPUUtil)
-			c.widgets.SetMem(c.reader.MemUsage, c.reader.MemLimit)
+			c.widgets.SetMem(c.reader.MemUsage, c.reader.MemLimit, c.reader.MemPercent)
 			c.widgets.SetNet(c.reader.NetRx, c.reader.NetTx)
 		}
 	}()
diff --git a/reader.go b/reader.go
index 796e2ac..7e39f1c 100644
--- a/reader.go
+++ b/reader.go
@@ -1,16 +1,18 @@
 package main
 
 import (
+	"math"
+
 	"github.com/fsouza/go-dockerclient"
 )
 
 type StatReader struct {
-	CPUUtil  float64
-	NetTx    int64
-	NetRx    int64
-	MemUsage int64
-	MemLimit int64
-	//MemPercent int64
+	CPUUtil    int
+	NetTx      int64
+	NetRx      int64
+	MemLimit   int64
+	MemPercent int
+	MemUsage   int64
 	lastCpu    float64
 	lastSysCpu float64
 }
@@ -28,7 +30,7 @@ func (s *StatReader) ReadCPU(stats *docker.Stats) {
 
 	cpudiff := total - s.lastCpu
 	syscpudiff := system - s.lastSysCpu
-	s.CPUUtil = (cpudiff / syscpudiff * 100) * ncpus
+	s.CPUUtil = round((cpudiff / syscpudiff * 100) * ncpus)
 	s.lastCpu = total
 	s.lastSysCpu = system
 }
@@ -36,7 +38,7 @@ func (s *StatReader) ReadCPU(stats *docker.Stats) {
 func (s *StatReader) ReadMem(stats *docker.Stats) {
 	s.MemUsage = int64(stats.MemoryStats.Usage)
 	s.MemLimit = int64(stats.MemoryStats.Limit)
-	//s.MemPercent = round((float64(cur) / float64(limit)) * 100)
+	s.MemPercent = round((float64(s.MemUsage) / float64(s.MemLimit)) * 100)
 }
 
 func (s *StatReader) ReadNet(stats *docker.Stats) {
@@ -46,3 +48,7 @@ func (s *StatReader) ReadNet(stats *docker.Stats) {
 		s.NetRx += int64(network.RxBytes)
 	}
 }
+
+func round(num float64) int {
+	return int(num + math.Copysign(0.5, num))
+}
diff --git a/sort.go b/sort.go
index 4f3b956..6fb7988 100644
--- a/sort.go
+++ b/sort.go
@@ -4,7 +4,7 @@ import (
 	"sort"
 )
 
-var SortFields = []string{"id", "name", "cpu", "mem"}
+var SortFields = []string{"id", "name", "cpu", "mem", "mem %"}
 
 // Sort array of containers by field
 func SortContainers(field string, containers []*Container) {
@@ -17,6 +17,8 @@ func SortContainers(field string, containers []*Container) {
 		sort.Sort(sort.Reverse(ByCPU(containers)))
 	case "mem":
 		sort.Sort(sort.Reverse(ByMem(containers)))
+	case "mem %":
+		sort.Sort(sort.Reverse(ByMemPercent(containers)))
 	default:
 		sort.Sort(ByID(containers))
 	}
@@ -45,3 +47,9 @@ type ByMem []*Container
 func (a ByMem) Len() int           { return len(a) }
 func (a ByMem) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
 func (a ByMem) Less(i, j int) bool { return a[i].reader.MemUsage < a[j].reader.MemUsage }
+
+type ByMemPercent []*Container
+
+func (a ByMemPercent) Len() int           { return len(a) }
+func (a ByMemPercent) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a ByMemPercent) Less(i, j int) bool { return a[i].reader.MemPercent < a[j].reader.MemPercent }
diff --git a/widgets/compact.go b/widgets/compact.go
index 59ae881..adf6f1c 100644
--- a/widgets/compact.go
+++ b/widgets/compact.go
@@ -35,23 +35,21 @@ func (w *Compact) Row() *ui.Row {
 	)
 }
 
-func (w *Compact) SetCPU(val float64) {
-	intVal := round(val)
-	w.Cpu.BarColor = colorScale(intVal)
-	w.Cpu.Label = fmt.Sprintf("%s%%", strconv.Itoa(intVal))
-	if intVal < 5 {
-		intVal = 5
+func (w *Compact) SetCPU(val int) {
+	w.Cpu.BarColor = colorScale(val)
+	w.Cpu.Label = fmt.Sprintf("%s%%", strconv.Itoa(val))
+	if val < 5 {
+		val = 5
 		w.Cpu.BarColor = ui.ColorBlack
 	}
-	w.Cpu.Percent = intVal
+	w.Cpu.Percent = val
 }
 
 func (w *Compact) SetNet(rx int64, tx int64) {
 	w.Net.Text = fmt.Sprintf("%s / %s", byteFormat(rx), byteFormat(tx))
 }
 
-func (w *Compact) SetMem(val int64, limit int64) {
-	percent := round((float64(val) / float64(limit)) * 100)
+func (w *Compact) SetMem(val int64, limit int64, percent int) {
 	w.Memory.Label = fmt.Sprintf("%s / %s", byteFormat(val), byteFormat(limit))
 	if percent < 5 {
 		percent = 5
diff --git a/widgets/util.go b/widgets/util.go
index e409a38..86a6793 100644
--- a/widgets/util.go
+++ b/widgets/util.go
@@ -2,7 +2,6 @@ package widgets
 
 import (
 	"fmt"
-	"math"
 	"strconv"
 
 	ui "github.com/gizak/termui"
@@ -30,10 +29,6 @@ func byteFormat(n int64) string {
 	return fmt.Sprintf("%sG", strconv.FormatInt(n, 10))
 }
 
-func round(num float64) int {
-	return int(num + math.Copysign(0.5, num))
-}
-
 func compactPar(s string) *ui.Par {
 	p := ui.NewPar(s)
 	p.Border = false