diff --git a/scripts/pi-hole/js/settings-system.js b/scripts/pi-hole/js/settings-system.js
index 32cabec2..59160cdc 100644
--- a/scripts/pi-hole/js/settings-system.js
+++ b/scripts/pi-hole/js/settings-system.js
@@ -9,19 +9,20 @@
 
 var hostinfoTimer = null;
 var cachePieChart = null;
-var cacheSize = 0;
+var cacheSize = 0,
+  cacheEntries = 0;
 
 var querytypeids = [];
 function updateCachePie(data) {
   var v = [],
     c = [],
     k = [],
-    i = 0,
-    sum = 0;
+    i = 0;
 
-  // Compute total number of queries
+  // Compute total number of cache entries
+  cacheEntries = 0;
   Object.keys(data).forEach(function (item) {
-    sum += data[item];
+    cacheEntries += data[item];
   });
 
   // Sort data by value, put OTHER always as last
@@ -43,13 +44,12 @@ function updateCachePie(data) {
   data = tmp;
 
   // Add empty space to chart
-  data.empty = cacheSize - sum;
-  sum = cacheSize;
+  data.empty = cacheSize - cacheEntries;
 
   // Fill chart with data
   querytypeids = [];
   Object.keys(data).forEach(function (item) {
-    v.push((100 * data[item]) / sum);
+    v.push((100 * data[item]) / cacheSize);
     c.push(item !== "empty" ? THEME_COLORS[i % THEME_COLORS.length] : "#80808040");
     k.push(item);
     querytypeids.push(i + 1);
@@ -155,6 +155,8 @@ function updateMetrics() {
       // Set metrics
       setMetrics(metrics, "sysinfo-");
 
+      $("#cache-efficiency").text(((100 * cacheEntries) / cacheSize).toFixed(2) + "%");
+
       $("div[id^='sysinfo-metrics-overlay']").hide();
       // Update every 10 seconds
       clearTimeout(metricsTimer);
diff --git a/settings-system.lp b/settings-system.lp
index 023db375..140a44ad 100644
--- a/settings-system.lp
+++ b/settings-system.lp
@@ -174,6 +174,12 @@ mg.include('scripts/pi-hole/lua/header_authenticated.lp','r')
                                     </th>
                                     <td id="sysinfo-dns-cache-size">&nbsp;</td>
                                 </tr>
+                                <tr>
+                                    <th scope="row">
+                                        <span title="Percentage of the allocated cache that is currently in use. If this value is very low, it is advisable to reduce the DNS cache size to optimize performance">DNS cache efficiency:</span>
+                                    </th>
+                                    <td id="cache-efficiency">&nbsp;</td>
+                                </tr>
                                 <tr>
                                     <th scope="row">
                                         <span title="Number of cache insertions">DNS cache insertions:</span>