diff --git a/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java b/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java
index e8f7438209..1cefd50fc5 100644
--- a/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java
+++ b/metrics-jetty12/src/main/java/io/dropwizard/metrics/jetty12/InstrumentedQueuedThreadPool.java
@@ -128,15 +128,10 @@ protected void doStart() throws Exception {
         metricRegistry.register(prefix.resolve(NAME_UTILIZATION), new RatioGauge() {
             @Override
             protected Ratio getRatio() {
-                return Ratio.of(getThreads() - getIdleThreads(), getThreads());
-            }
-        });
-        metricRegistry.register(prefix.resolve(NAME_UTILIZATION_MAX), new RatioGauge() {
-            @Override
-            protected Ratio getRatio() {
-                return Ratio.of(getThreads() - getIdleThreads(), getMaxThreads());
+                return  Ratio.of(getUtilizedThreads(), getThreads() - getLeasedThreads());
             }
         });
+        metricRegistry.registerGauge(prefix.resolve(NAME_UTILIZATION_MAX), this::getUtilizationRate);
         metricRegistry.registerGauge(prefix.resolve(NAME_SIZE), this::getThreads);
         // This assumes the QueuedThreadPool is using a BlockingArrayQueue or
         // ArrayBlockingQueue for its queue, and is therefore a constant-time operation.