diff --git a/Readme.md b/Readme.md
index 1c88805..259d396 100644
--- a/Readme.md
+++ b/Readme.md
@@ -186,7 +186,7 @@ metrics:
  - prom_name: humidity
   # The name of the metric in a MQTT JSON message
    mqtt_name: humidity
-  # The scale of the metric in a MQTT JSON message (mqtt_value : scale = prom_value : 1)
+  # The scale of the metric in a MQTT JSON message (prom_value = mqtt_value * scale)
    mqtt_value_scale: 100
   # The prometheus help text for this metric
    help: DHT22 humidity reading
diff --git a/pkg/metrics/parser.go b/pkg/metrics/parser.go
index 2a59eb0..c08da3b 100644
--- a/pkg/metrics/parser.go
+++ b/pkg/metrics/parser.go
@@ -96,7 +96,7 @@ func (p *Parser) parseMetric(metricPath string, deviceID string, value interface
 	}
 
 	if cfg.MQTTValueScale != 0 {
-		metricValue = metricValue / cfg.MQTTValueScale
+		metricValue = metricValue * cfg.MQTTValueScale
 	}
 
 	return Metric{
diff --git a/pkg/metrics/parser_test.go b/pkg/metrics/parser_test.go
index 64f5429..8d6a680 100644
--- a/pkg/metrics/parser_test.go
+++ b/pkg/metrics/parser_test.go
@@ -59,7 +59,7 @@ func TestParser_parseMetric(t *testing.T) {
 						{
 							PrometheusName: "temperature",
 							ValueType:      "gauge",
-							MQTTValueScale: 100,
+							MQTTValueScale: 0.01,
 						},
 					},
 				},
@@ -129,7 +129,7 @@ func TestParser_parseMetric(t *testing.T) {
 						{
 							PrometheusName: "humidity",
 							ValueType:      "gauge",
-							MQTTValueScale: 100,
+							MQTTValueScale: 0.01,
 						},
 					},
 				},
@@ -155,7 +155,7 @@ func TestParser_parseMetric(t *testing.T) {
 						{
 							PrometheusName: "humidity",
 							ValueType:      "gauge",
-							MQTTValueScale: -0.5,
+							MQTTValueScale: -2,
 						},
 					},
 				},
@@ -206,7 +206,7 @@ func TestParser_parseMetric(t *testing.T) {
 						{
 							PrometheusName: "enabled",
 							ValueType:      "gauge",
-							MQTTValueScale: 2,
+							MQTTValueScale: 0.5,
 						},
 					},
 				},