diff --git a/lib/bs412.c b/lib/bs412.c
index 5f3d72a..e327730 100644
--- a/lib/bs412.c
+++ b/lib/bs412.c
@@ -1,11 +1,11 @@
 #include "bs412.h"
 
 float dbr_to_deviation(float dbr) {
-	return 19000.0f * powf(10.0f, dbr / 20.0f);
+	return 19000.0f * powf(10.0f, dbr / 10.0f);
 }
 
 float deviation_to_dbr(float deviation) {
-	return 20 * log10f((deviation + 1e-6f) / 19000.0f);
+	return 10 * log10f((deviation + 1e-6f) / 19000.0f);
 }
 
 void init_modulation_power_measure(MPXPowerMeasurement* mpx, int sample_rate) {