diff --git a/collectors/cpustatMetric.go b/collectors/cpustatMetric.go
index bd6ec2f..2b1756f 100644
--- a/collectors/cpustatMetric.go
+++ b/collectors/cpustatMetric.go
@@ -119,12 +119,21 @@ func (m *CpustatCollector) parseStatLine(linefields []string, tags map[string]st
 		}
 	}
 
+	sum := float64(0)
 	for name, value := range values {
+		sum += value
 		y, err := lp.New(name, tags, m.meta, map[string]interface{}{"value": value * 100}, now)
 		if err == nil {
 			output <- y
 		}
 	}
+	if v, ok := values["cpu_idle"]; ok {
+		sum -= v
+		y, err := lp.New("cpu_used", tags, m.meta, map[string]interface{}{"value": sum * 100}, now)
+		if err == nil {
+			output <- y
+		}
+	}
 }
 
 func (m *CpustatCollector) Read(interval time.Duration, output chan lp.CCMetric) {
diff --git a/collectors/cpustatMetric.md b/collectors/cpustatMetric.md
index 8963536..d160410 100644
--- a/collectors/cpustatMetric.md
+++ b/collectors/cpustatMetric.md
@@ -23,3 +23,4 @@ Metrics:
 * `cpu_steal`
 * `cpu_guest`
 * `cpu_guest_nice`
+* `cpu_used` = `cpu_* - cpu_idle`
\ No newline at end of file