diff --git a/client/src/main/java/ctbrec/ui/RecordingsTab.java b/client/src/main/java/ctbrec/ui/RecordingsTab.java
index 6581bcb5..b60d439b 100644
--- a/client/src/main/java/ctbrec/ui/RecordingsTab.java
+++ b/client/src/main/java/ctbrec/ui/RecordingsTab.java
@@ -160,20 +160,7 @@ public class RecordingsTab extends Tab implements TabSelectionListener {
                         if(empty || sizeInByte == null) {
                             setText(null);
                         } else {
-                            DecimalFormat df = new DecimalFormat("0.00");
-                            String unit = "Bytes";
-                            double size = sizeInByte.doubleValue();
-                            if(size > 1024.0 * 1024 * 1024) {
-                                size = size / 1024.0 / 1024 / 1024;
-                                unit = "GiB";
-                            } else if(size > 1024.0 * 1024) {
-                                size = size / 1024.0 / 1024;
-                                unit = "MiB";
-                            } else if(size > 1024.0) {
-                                size = size / 1024.0;
-                                unit = "KiB";
-                            }
-                            setText(df.format(size) + ' ' + unit);
+                            setText(StringUtil.formatSize(sizeInByte));
                         }
                     }
                 };
diff --git a/common/src/main/java/ctbrec/StringUtil.java b/common/src/main/java/ctbrec/StringUtil.java
index 229e44b1..d9ae9796 100644
--- a/common/src/main/java/ctbrec/StringUtil.java
+++ b/common/src/main/java/ctbrec/StringUtil.java
@@ -1,5 +1,7 @@
 package ctbrec;
 
+import java.text.DecimalFormat;
+
 public class StringUtil {
     public static boolean isBlank(String s) {
         return s == null || s.trim().isEmpty();
@@ -8,4 +10,21 @@ public class StringUtil {
     public static boolean isNotBlank(String s) {
         return !isBlank(s);
     }
+
+    public static String formatSize(Number sizeInByte) {
+        DecimalFormat df = new DecimalFormat("0.00");
+        String unit = "Bytes";
+        double size = sizeInByte.doubleValue();
+        if(size > 1024.0 * 1024 * 1024) {
+            size = size / 1024.0 / 1024 / 1024;
+            unit = "GiB";
+        } else if(size > 1024.0 * 1024) {
+            size = size / 1024.0 / 1024;
+            unit = "MiB";
+        } else if(size > 1024.0) {
+            size = size / 1024.0;
+            unit = "KiB";
+        }
+        return df.format(size) + ' ' + unit;
+    }
 }