diff --git a/htdocs/frontend/javascripts/frontend.js b/htdocs/frontend/javascripts/frontend.js
index 511f816..5760d2f 100644
--- a/htdocs/frontend/javascripts/frontend.js
+++ b/htdocs/frontend/javascripts/frontend.js
@@ -368,10 +368,11 @@ vz.entities.loadData = function() {
 							.attr('title', $.plot.formatDate(new Date(entity.data.max.timestamp), '%d. %b %h:%M:%S', vz.options.plot.xaxis.monthNames));	
 					}
 					if (entity.data.average) {
-						$('#entity-' + entity.uuid + ' .average').text(entity.data.average);
+						$('#entity-' + entity.uuid + ' .average').text(Math.round(entity.data.average/vz.options.rounding)*vz.options.rounding);
+						// rounding: Math.round rounds to whole numbers; to round to one decimal (e.g. 15.2) we multiply by 10 (resp. divide through 0.1), round and reverse the multiplication again; therefore "vz.options.rounding" needs to be set to 0.1 in that case
 					}
 					if (entity.data.last) {
-						$('#entity-' + entity.uuid + ' .last').text(entity.data.last)
+						$('#entity-' + entity.uuid + ' .last').text(Math.round(entity.data.last/vz.options.rounding)*vz.options.rounding);
 					}
 				}, vz.drawPlot, 'data')
 			);
diff --git a/htdocs/frontend/javascripts/options.js b/htdocs/frontend/javascripts/options.js
index de66ab5..ca883e9 100644
--- a/htdocs/frontend/javascripts/options.js
+++ b/htdocs/frontend/javascripts/options.js
@@ -29,6 +29,7 @@ vz.options = {
 	language: 'de',
 	backendUrl: '../backend.php',
 	tuples: 300,
+	rounding: 0.1,
 	render: 'lines',
 	refresh: false,
 	refreshInterval: 5*1000, // 5 secs
diff --git a/lib/Interpreter/SensorInterpreter.php b/lib/Interpreter/SensorInterpreter.php
index e9bf148..0761736 100644
--- a/lib/Interpreter/SensorInterpreter.php
+++ b/lib/Interpreter/SensorInterpreter.php
@@ -87,7 +87,7 @@ class SensorInterpreter extends Interpreter {
 	 * @return float
 	 */
 	public function getLast() {
-		return round((float) $this->conn->fetchColumn('SELECT value FROM data WHERE channel_id = ?' . parent::buildDateTimeFilterSQL($this->from, $this->to). ' ORDER BY timestamp DESC', array($this->channel->getId()), 0), 1);
+		return (float) $this->conn->fetchColumn('SELECT value FROM data WHERE channel_id = ?' . parent::buildDateTimeFilterSQL($this->from, $this->to). ' ORDER BY timestamp DESC', array($this->channel->getId()), 0);
 	}
 
 	/**