diff --git a/config/config.default.php b/config/config.default.php
index e9ec0427..a8f4f454 100644
--- a/config/config.default.php
+++ b/config/config.default.php
@@ -47,6 +47,12 @@ $shift_sum_formula = "SUM(
   ))*(`Shifts`.`end` - `Shifts`.`start`)*(1 - 3 * `ShiftEntry`.`freeloaded`)
 )";
 
+// voucher calculation 
+$voucher_settings = array(
+	"initial_vouchers" => 2,
+	"shifts_per_voucher" => 1
+);
+
 // weigh every shift the same
 // $shift_sum_formula = "SUM(`end` - `start`)";
 
diff --git a/includes/model/ShiftEntry_model.php b/includes/model/ShiftEntry_model.php
index 008531ff..6324c3bf 100644
--- a/includes/model/ShiftEntry_model.php
+++ b/includes/model/ShiftEntry_model.php
@@ -84,6 +84,23 @@ function ShiftEntries_upcoming_for_user($user) {
       ");
 }
 
+/**
+ * Returns shifts completed by the given user.
+ *
+ * @param User $user          
+ */
+function ShiftEntries_finished_by_user($user){
+	  return sql_select("
+      SELECT *
+      FROM `ShiftEntry`
+      JOIN `Shifts` ON (`Shifts`.`SID` = `ShiftEntry`.`SID`)
+      JOIN `ShiftTypes` ON `ShiftTypes`.`id` = `Shifts`.`shifttype_id`
+      WHERE `ShiftEntry`.`UID`=" . sql_escape($user['UID']) . "
+      AND `Shifts`.`end` < " . sql_escape(time()) . "
+      ORDER BY `Shifts`.`end`
+      ");
+}
+
 /**
  * Returns all shift entries in given shift for given angeltype.
  *
diff --git a/includes/model/User_model.php b/includes/model/User_model.php
index e1bb2733..00c3bfdd 100644
--- a/includes/model/User_model.php
+++ b/includes/model/User_model.php
@@ -260,4 +260,19 @@ function User_generate_password_recovery_token(&$user) {
   return $user['password_recovery_token'];
 }
 
+
+function User_get_eligable_voucher_count(&$user) {
+  global $voucher_settings;
+  
+	$shifts_done = count(ShiftEntries_finished_by_user($user));
+	
+	$earned_vouchers = $user['got_voucher'] - $voucher_settings['initial_vouchers'];
+	$elegible_vouchers = $shifts_done / $voucher_settings['shifts_per_voucher'] - $earned_vouchers;
+	if ( $elegible_vouchers < 0) {
+		return 0;
+	}
+	
+	return $elegible_vouchers;
+}
+
 ?>
diff --git a/includes/view/User_view.php b/includes/view/User_view.php
index 09668d6f..dbdc617b 100644
--- a/includes/view/User_view.php
+++ b/includes/view/User_view.php
@@ -45,8 +45,10 @@ function User_edit_vouchers_view($user) {
       buttons([
           button(user_link($user), glyph('chevron-left') . _("back")) 
       ]),
+      heading(sprintf(_("angel should receive at least  %d vouchers."), User_get_eligable_voucher_count($user)), 3),
+      heading(_("This is a automatically calculated MINIMUM value, you can of course give out more if appropriate!"), 4),
       form([
-          form_spinner('vouchers', _("Number of vouchers"), $user['got_voucher']),
+          form_spinner('vouchers', _("Number of vouchers given out"), $user['got_voucher']),
           form_submit('submit', _("Save")) 
       ], page_link_to('users') . '&action=edit_vouchers&user_id=' . $user['UID']) 
   ]);
diff --git a/locale/de_DE.UTF-8/LC_MESSAGES/default.mo b/locale/de_DE.UTF-8/LC_MESSAGES/default.mo
index c44c9a58..c9139c28 100644
Binary files a/locale/de_DE.UTF-8/LC_MESSAGES/default.mo and b/locale/de_DE.UTF-8/LC_MESSAGES/default.mo differ
diff --git a/locale/de_DE.UTF-8/LC_MESSAGES/default.po b/locale/de_DE.UTF-8/LC_MESSAGES/default.po
index 5ef5027a..30e5c8dd 100644
--- a/locale/de_DE.UTF-8/LC_MESSAGES/default.po
+++ b/locale/de_DE.UTF-8/LC_MESSAGES/default.po
@@ -2402,6 +2402,24 @@ msgstr ""
 "Du hast keinen Zugriff auf diese Seite. Registriere Dich und logge Dich "
 "bitte ein, um Zugriff zu erhalten!"
 
+#: /Users/msquare/workspace/projects/engelsystem/includes/view/User_view.php:49
+msgid ""
+"angel should receive at least  %d vouchers."
+msgstr ""
+"Engel sollte mindestens %d voucher bekommen."
+
+#: /Users/msquare/workspace/projects/engelsystem/includes/view/User_view.php:49
+msgid ""
+" vouchers."
+msgstr ""
+" Vouchers."
+
+#: /Users/msquare/workspace/projects/engelsystem/includes/view/User_view.php:50
+msgid ""
+"This is a automatically calculated MINIMUM value, you can of course give out more if appropriate!"
+msgstr ""
+"Dies ist ein automatisch berechneter MINIMAL Wert, du kannst natürlich mehr ausgeben, wenn du es für angemessen hälst!"
+
 #~ msgid "You have been signed off from the shift."
 #~ msgstr "Du wurdest aus der Schicht ausgetragen."