diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardController.java b/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardController.java
index 92c538d66..c1c138c0a 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardController.java
@@ -25,6 +25,7 @@ import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.math.BigDecimal;
+import java.math.RoundingMode;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -126,19 +127,21 @@ public class DashboardController extends GenericForwardComposer {
 
     private void renderOvertimeRatio() {
         BigDecimal overtimeRatio = dashboardModel.getOvertimeRatio();
-        lblOvertimeRatio.setValue(String.format("%.2f", overtimeRatio.doubleValue()));
-        String valueMeaning = (overtimeRatio.doubleValue() > 1) ? "negative"
-                : "positive";
+        lblOvertimeRatio.setValue(showAsPercentage(overtimeRatio));
+        String valueMeaning = (overtimeRatio.compareTo(BigDecimal.ZERO) == 0) ? "positive"
+                : "negative";
         lblOvertimeRatio.setSclass("dashboard-label-remarked " + valueMeaning);
     }
 
+    private String showAsPercentage(BigDecimal overtimeRatio) {
+        return overtimeRatio.multiply(BigDecimal.valueOf(100)).setScale(0,
+                RoundingMode.HALF_UP)
+                + " %";
+    }
+
     private void renderAvailabilityRatio() {
-        lblAvailabilityRatio.setValue(String.format("%.2f", dashboardModel
-                .getAvailabilityRatio().doubleValue()));
-        String valueMeaning = (dashboardModel.getAvailabilityRatio()
-                .doubleValue() > 1) ? "negative" : "positive";
-        lblAvailabilityRatio.setSclass("dashboard-label-remarked "
-                + valueMeaning);
+        lblAvailabilityRatio.setValue(showAsPercentage(dashboardModel
+                .getAvailabilityRatio()));
     }
 
     private void renderCostStatus(Order order) {
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardModel.java b/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardModel.java
index 854db6f51..298d3a256 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardModel.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/DashboardModel.java
@@ -519,12 +519,11 @@ public class DashboardModel implements IDashboardModel {
 
     @Override
     public BigDecimal getOvertimeRatio() {
-        EffortDuration load = sumAll(resourceLoadCalculator.getAllLoad());
+        EffortDuration totalLoad = sumAll(resourceLoadCalculator.getAllLoad());
         EffortDuration overload = sumAll(resourceLoadCalculator
                 .getAllOverload());
-        return EffortDuration.sum(load, overload)
-                .dividedByAndResultAsBigDecimal(load)
-                .setScale(2, RoundingMode.HALF_UP);
+        return overload.dividedByAndResultAsBigDecimal(totalLoad).setScale(2,
+                RoundingMode.HALF_UP);
     }
 
     private EffortDuration sumAll(
@@ -542,11 +541,15 @@ public class DashboardModel implements IDashboardModel {
 
     @Override
     public BigDecimal getAvailabilityRatio() {
-        EffortDuration load = sumAll(resourceLoadCalculator.getAllLoad());
+        EffortDuration totalLoad = sumAll(resourceLoadCalculator.getAllLoad());
+        EffortDuration overload = sumAll(resourceLoadCalculator
+                .getAllOverload());
+        EffortDuration load = totalLoad.minus(overload);
+
         EffortDuration capacity = sumAll(resourceLoadCalculator
                 .getMaxCapacityOnResources());
-        return load.dividedByAndResultAsBigDecimal(capacity).setScale(2,
-                RoundingMode.HALF_UP);
+        return BigDecimal.ONE.setScale(2, RoundingMode.HALF_UP).subtract(
+                load.dividedByAndResultAsBigDecimal(capacity));
     }
 
 }
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/IDashboardModel.java b/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/IDashboardModel.java
index 90c1a2882..7c9e3cd81 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/IDashboardModel.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/dashboard/IDashboardModel.java
@@ -80,10 +80,14 @@ interface IDashboardModel {
 
     /* Resources KPI: "Overtime Ratio" */
 
-    // (Load + Overload) / Load
+    /**
+     * Formula: Overload / (Load + Overload)
+     */
     BigDecimal getOvertimeRatio();
 
-    // Load / Capacity
+    /**
+     * Formula: 1 - (Load / Capacity)
+     */
     BigDecimal getAvailabilityRatio();
 
 }