diff --git a/htdocs/core/class/dolgraph.class.php b/htdocs/core/class/dolgraph.class.php
index 37f1d6036c6..4cd58a63378 100644
--- a/htdocs/core/class/dolgraph.class.php
+++ b/htdocs/core/class/dolgraph.class.php
@@ -1124,7 +1124,20 @@ class DolGraph
 		$this->stringtoshow .= '</script>'."\n";
 	}
 
-
+	/**
+	 * Output HTML string to total value
+	 *
+	 * @return	string							HTML string to total value
+	 */
+    public function total()
+	{
+      $value = 0;
+			foreach($this->data as $valarray)	// Loop on each x
+			{
+				$value += $valarray[1];
+			}
+      return $value;
+	}
 
 	/**
 	 * Output HTML string to show graph