diff --git a/www/Utils.js b/www/Utils.js
index 2d0993a3..f678a916 100644
--- a/www/Utils.js
+++ b/www/Utils.js
@@ -247,6 +247,14 @@ Ext.define('PBS.Utils', {
         };
     },
 
+    calculate_dedup_factor: function(gcstatus) {
+	let dedup = 1.0;
+	if (gcstatus['disk-bytes'] > 0) {
+	    dedup = (gcstatus['index-data-bytes'] || 0)/gcstatus['disk-bytes'];
+	}
+	return dedup;
+    },
+
     constructor: function() {
 	var me = this;
 
diff --git a/www/datastore/Summary.js b/www/datastore/Summary.js
index ac3f19e2..5c757e8c 100644
--- a/www/datastore/Summary.js
+++ b/www/datastore/Summary.js
@@ -57,10 +57,7 @@ Ext.define('PBS.DataStoreInfo', {
 
 	    let gcstatus = store.getById('gc-status').data.value;
 
-	    let dedup = 1.0;
-	    if (gcstatus['disk-bytes'] > 0) {
-		dedup = (gcstatus['index-data-bytes'] || 0)/gcstatus['disk-bytes'];
-	    }
+	    let dedup = PBS.Utils.calculate_dedup_factor(gcstatus);
 
 	    let countstext = function(count) {
 		count = count || {};