diff --git a/db/install.xml b/db/install.xml
index b1fc454..e683ef6 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -68,7 +68,7 @@
         <FIELD NAME="attendanceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
         <FIELD NAME="acronym" TYPE="char" LENGTH="2" NOTNULL="true" SEQUENCE="false"/>
         <FIELD NAME="description" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="5" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="2"/>
         <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false"/>
         <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
         <FIELD NAME="setnumber" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Allows different sets of statuses to be allocated to different sessions"/>
diff --git a/db/upgrade.php b/db/upgrade.php
index 75bf87e..ec1488f 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -145,5 +145,18 @@ function xmldb_attendance_upgrade($oldversion=0) {
         upgrade_mod_savepoint(true, 2015040502, 'attendance');
     }
 
+    if ($oldversion < 2015040503) {
+
+        // Changing type of field grade on table attendance_statuses to number.
+        $table = new xmldb_table('attendance_statuses');
+        $field = new xmldb_field('grade', XMLDB_TYPE_NUMBER, '5, 2', null, XMLDB_NOTNULL, null, '0', 'description');
+
+        // Launch change of type for field grade.
+        $dbman->change_field_type($table, $field);
+
+        // Attendance savepoint reached.
+        upgrade_mod_savepoint(true, 2015040503, 'attendance');
+    }
+
     return $result;
 }
diff --git a/export.php b/export.php
index f70682b..76de1b4 100644
--- a/export.php
+++ b/export.php
@@ -118,6 +118,7 @@ if ($mform->is_submitted()) {
         }
         if ($reportdata->gradable) {
             $data->tabhead[] = get_string('grade');
+            $data->tabhead[] = get_string('percentage', 'attendance');
         }
 
         $i = 0;
@@ -151,7 +152,14 @@ if ($mform->is_submitted()) {
             $cellsgenerator = new user_sessions_cells_text_generator($reportdata, $user);
             $data->table[$i] = array_merge($data->table[$i], $cellsgenerator->get_cells(isset($formdata->includeremarks)));
             if ($reportdata->gradable) {
-                $data->table[$i][] = $reportdata->grades[$user->id].' / '.$reportdata->maxgrades[$user->id];
+                $data->table[$i][] = format_float($reportdata->grades[$user->id]).' / '.
+                    format_float($reportdata->maxgrades[$user->id]);
+                if ($reportdata->maxgrades[$user->id]) {
+                    $percent = $reportdata->grades[$user->id] * 100.0 / $reportdata->maxgrades[$user->id];
+                } else {
+                    $percent = 0.0;
+                }
+                $data->table[$i][] = $percent;
             }
             $i++;
         }
diff --git a/preferences.php b/preferences.php
index 210734e..57b53ea 100644
--- a/preferences.php
+++ b/preferences.php
@@ -59,7 +59,8 @@ switch ($att->pageparams->action) {
     case att_preferences_page_params::ACTION_ADD:
         $newacronym         = optional_param('newacronym', null, PARAM_TEXT);
         $newdescription     = optional_param('newdescription', null, PARAM_TEXT);
-        $newgrade           = optional_param('newgrade', 0, PARAM_INT);
+        $newgrade           = optional_param('newgrade', 0, PARAM_RAW);
+        $newgrade = unformat_float($newgrade);
 
         $att->add_status($newacronym, $newdescription, $newgrade);
         if ($pageparams->statusset > $maxstatusset) {
@@ -103,7 +104,10 @@ switch ($att->pageparams->action) {
     case att_preferences_page_params::ACTION_SAVE:
         $acronym        = required_param_array('acronym', PARAM_MULTILANG);
         $description    = required_param_array('description', PARAM_MULTILANG);
-        $grade          = required_param_array('grade', PARAM_INT);
+        $grade          = required_param_array('grade', PARAM_RAW);
+        foreach ($grade as &$val) {
+            $val = unformat_float($val);
+        }
         $statuses = $att->get_statuses(false);
 
         foreach ($acronym as $id => $v) {
diff --git a/renderer.php b/renderer.php
index 2aad1e8..c393bf0 100644
--- a/renderer.php
+++ b/renderer.php
@@ -860,7 +860,7 @@ class mod_attendance_renderer extends plugin_renderer_base {
             }
 
             if ($reportdata->gradable) {
-                $row->cells[] = $reportdata->grades[$user->id].' / '.$reportdata->maxgrades[$user->id];
+                $row->cells[] = format_float($reportdata->grades[$user->id]).' / '.format_float($reportdata->maxgrades[$user->id]);
             }
 
             if ($reportdata->sessionslog) {
@@ -962,7 +962,7 @@ class mod_attendance_renderer extends plugin_renderer_base {
             $table->data[$i][] = $i;
             $table->data[$i][] = $this->construct_text_input('acronym['.$st->id.']', 2, 2, $st->acronym);
             $table->data[$i][] = $this->construct_text_input('description['.$st->id.']', 30, 30, $st->description);
-            $table->data[$i][] = $this->construct_text_input('grade['.$st->id.']', 4, 4, $st->grade);
+            $table->data[$i][] = $this->construct_text_input('grade['.$st->id.']', 4, 4, format_float($st->grade));
             $table->data[$i][] = $this->construct_preferences_actions_icons($st, $prefdata);
 
             $i++;
diff --git a/renderhelpers.php b/renderhelpers.php
index 15ab178..f190c7f 100644
--- a/renderhelpers.php
+++ b/renderhelpers.php
@@ -237,7 +237,7 @@ function construct_user_data_stat($stat, $statuses, $gradable, $grade, $maxgrade
         $row = new html_table_row();
         $row->cells[] = get_string('attendancegrade', 'attendance') .
                         $OUTPUT->help_icon('gradebookexplanation', 'attendance') . ':';
-        $row->cells[] = $grade . ' / ' . $maxgrade;
+        $row->cells[] = format_float($grade) . ' / ' . format_float($maxgrade);
         $stattable->data[] = $row;
 
         $row = new html_table_row();
@@ -247,7 +247,7 @@ function construct_user_data_stat($stat, $statuses, $gradable, $grade, $maxgrade
         } else {
             $percent = $grade / $maxgrade * 100;
         }
-        $row->cells[] = sprintf("%0.{$decimalpoints}f", $percent);
+        $row->cells[] = format_float(sprintf("%0.{$decimalpoints}f", $percent));
         $stattable->data[] = $row;
     }
 
diff --git a/version.php b/version.php
index 7872ebf..ff213d4 100644
--- a/version.php
+++ b/version.php
@@ -22,7 +22,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$plugin->version  = 2015040502;
+$plugin->version  = 2015040503;
 $plugin->requires = 2014042900;
 $plugin->release = '2.9.1';
 $plugin->maturity  = MATURITY_STABLE;