diff --git a/src/main/java/io/jenkins/plugins/coverage/model/CoverageBuildAction.java b/src/main/java/io/jenkins/plugins/coverage/model/CoverageBuildAction.java
index f4799cb..dbb9438 100644
--- a/src/main/java/io/jenkins/plugins/coverage/model/CoverageBuildAction.java
+++ b/src/main/java/io/jenkins/plugins/coverage/model/CoverageBuildAction.java
@@ -156,7 +156,7 @@ public class CoverageBuildAction extends BuildAction<CoverageNode> implements He
     // TODO: format percentage on the client side
     public String getDelta(final CoverageMetric metric) {
         if (hasDelta(metric)) {
-            return String.format("%+.3f", delta.get(metric));
+            return String.format("%+.1f%%", delta.get(metric) * 100);
         }
         return "n/a";
     }
diff --git a/src/main/resources/io/jenkins/plugins/coverage/model/CoverageBuildAction/summary.jelly b/src/main/resources/io/jenkins/plugins/coverage/model/CoverageBuildAction/summary.jelly
index 687f207..8eb8985 100644
--- a/src/main/resources/io/jenkins/plugins/coverage/model/CoverageBuildAction/summary.jelly
+++ b/src/main/resources/io/jenkins/plugins/coverage/model/CoverageBuildAction/summary.jelly
@@ -24,7 +24,7 @@
                 <j:set var="color" value="#0a5f0e"/>
               </j:otherwise>
             </j:choose>
-            <span style="color: ${color}">(${it.getDelta(metric)}%)</span>
+            <span style="color: ${color}">(${it.getDelta(metric)})</span>
           </j:if>
         </li>
       </j:forEach>