diff --git a/src/devices/ambient_weather.c b/src/devices/ambient_weather.c
index ad4301116..34361a1cf 100644
--- a/src/devices/ambient_weather.c
+++ b/src/devices/ambient_weather.c
@@ -41,7 +41,7 @@ static int ambient_weather_decode(r_device *decoder, bitbuffer_t *bitbuffer, uns
     isBatteryLow = (b[2] & 0x80) != 0; // if not zero, battery is low
     channel = ((b[2] & 0x70) >> 4) + 1;
     int temp_f = ((b[2] & 0x0f) << 8) | b[3];
-    temperature = (temp_f - 400) / 10.0f;
+    temperature = (temp_f - 400) * 0.1f;
     humidity = b[4];
 
     data = data_make(
diff --git a/src/devices/bresser_3ch.c b/src/devices/bresser_3ch.c
index 897405c44..99f8c0f72 100644
--- a/src/devices/bresser_3ch.c
+++ b/src/devices/bresser_3ch.c
@@ -58,7 +58,7 @@ static int bresser_3ch_callback(r_device *decoder, bitbuffer_t *bitbuffer) {
 
     temp_raw = ((b[1] & 0x0F) << 8) + b[2];
     // 12 bits allows for values -90.0 F - 319.6 F (-67 C - 159 C)
-    temp_f = (temp_raw - 900) / 10.0;
+    temp_f = (temp_raw - 900) * 0.1f;
 
     humidity = b[3];
 
diff --git a/src/devices/digitech_xc0324.c b/src/devices/digitech_xc0324.c
index eddd7e4d1..96d871a14 100644
--- a/src/devices/digitech_xc0324.c
+++ b/src/devices/digitech_xc0324.c
@@ -106,8 +106,8 @@ static int decode_xc0324_message(r_device *decoder, bitbuffer_t *bitbuffer,
 
     // Decode temperature (b[2]), plus 1st 4 bits b[3], LSB first order!
     // Tenths of degrees C, offset from the minimum possible (-40.0 degrees)
-    uint16_t temp = ((uint16_t)(reverse8(b[3]) & 0x0f) << 8) | reverse8(b[2]);
-    temperature   = (temp / 10.0) - 40.0;
+    int temp = ((uint16_t)(reverse8(b[3]) & 0x0f) << 8) | reverse8(b[2]);
+    temperature   = (temp - 400) * 0.1f;
 
     //Unknown byte, constant as 0x80 in all my data
     // ??maybe battery status??
diff --git a/src/devices/ecowitt.c b/src/devices/ecowitt.c
index 46f4ca3b1..85430970d 100644
--- a/src/devices/ecowitt.c
+++ b/src/devices/ecowitt.c
@@ -73,9 +73,8 @@ static int ecowitt_decode(r_device *decoder, bitbuffer_t *bitbuffer)
     }
 
     // Temperature is next 10 bits
-    float temp_c = -40.0; // Bias
-    temp_c += (float)b[3] / 10.0;
-    temp_c += (float)((b[2] & 0x3) << 8) / 10.0;
+    int temp_raw = ((b[2] & 0x3) << 8) | b[3];
+    float temp_c = (temp_raw - 400) * 0.1f;
 
     // All Ecowitt observed packets have bits 39-48 set.
     if (b[4] != 0xFF) {
diff --git a/src/devices/emontx.c b/src/devices/emontx.c
index aa8a032cb..9b16f7c27 100644
--- a/src/devices/emontx.c
+++ b/src/devices/emontx.c
@@ -119,12 +119,12 @@ static int emontx_callback(r_device *decoder, bitbuffer_t *bitbuffer) {
                  _X("batt_Vrms","Vrms/batt"), "", DATA_FORMAT, "%.2f", DATA_DOUBLE, vrms,
                  "pulse", "", DATA_FORMAT, "%u", DATA_INT, words[11] | ((uint32_t)words[12] << 16),
                  // Slightly horrid... a value of 300.0°C means 'no reading'. So omit them completely.
-                 words[5] == 3000 ? NULL : "temp1_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, (double)words[5] / 10.0,
-                 words[6] == 3000 ? NULL : "temp2_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, (double)words[6] / 10.0,
-                 words[7] == 3000 ? NULL : "temp3_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, (double)words[7] / 10.0,
-                 words[8] == 3000 ? NULL : "temp4_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, (double)words[8] / 10.0,
-                 words[9] == 3000 ? NULL : "temp5_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, (double)words[9] / 10.0,
-                 words[10] == 3000 ? NULL : "temp6_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, (double)words[10] / 10.0,
+                 words[5] == 3000 ? NULL : "temp1_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, words[5] * 0.1f,
+                 words[6] == 3000 ? NULL : "temp2_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, words[6] * 0.1f,
+                 words[7] == 3000 ? NULL : "temp3_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, words[7] * 0.1f,
+                 words[8] == 3000 ? NULL : "temp4_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, words[8] * 0.1f,
+                 words[9] == 3000 ? NULL : "temp5_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, words[9] * 0.1f,
+                 words[10] == 3000 ? NULL : "temp6_C", "", DATA_FORMAT, "%.1f", DATA_DOUBLE, words[10] * 0.1f,
                  "mic",           "Integrity",   DATA_STRING, "CRC",
                  NULL);
         decoder_output_data(decoder, data);
diff --git a/src/devices/lacrossews.c b/src/devices/lacrossews.c
index 53a9017a8..2462827e4 100644
--- a/src/devices/lacrossews.c
+++ b/src/devices/lacrossews.c
@@ -168,7 +168,7 @@ static int lacrossews_callback(r_device *decoder, bitbuffer_t *bitbuffer)
 
         case 7: // Gust
             wind_dir = msg_nybbles[9] * 22.5;
-            wind_spd = (msg_nybbles[7] * 16 + msg_nybbles[8]) / 10.0;
+            wind_spd = (msg_nybbles[7] * 16 + msg_nybbles[8]) * 0.1f;
             if (msg_nybbles[7] == 0xF && msg_nybbles[8] == 0xE) {
                 if (decoder->verbose) {
                     fprintf(stderr, "LaCrosse WS %02X-%02X: %s Not Connected\n",
diff --git a/src/devices/mebus.c b/src/devices/mebus.c
index 0e88d1650..5f344abe3 100644
--- a/src/devices/mebus.c
+++ b/src/devices/mebus.c
@@ -40,7 +40,7 @@ static int mebus433_callback(r_device *decoder, bitbuffer_t *bitbuffer) {
                 "battery",       "Battery",     DATA_STRING, battery ? "OK" : "LOW",
                 "unknown1",      "Unknown 1",   DATA_INT, unknown1,
                 "unknown2",      "Unknown 2",   DATA_INT, unknown2,
-                "temperature_C", "Temperature", DATA_FORMAT, "%.02f C", DATA_DOUBLE, temp / 10.0,
+                "temperature_C", "Temperature", DATA_FORMAT, "%.02f C", DATA_DOUBLE, temp * 0.1f,
                 "humidity",      "Humidity",    DATA_FORMAT, "%u %%", DATA_INT, hum,
                 NULL);
         decoder_output_data(decoder, data);
diff --git a/src/devices/thermopro_tp11.c b/src/devices/thermopro_tp11.c
index 075864b63..a98d4fa32 100644
--- a/src/devices/thermopro_tp11.c
+++ b/src/devices/thermopro_tp11.c
@@ -44,7 +44,7 @@ static int thermopro_tp11_sensor_callback(r_device *decoder, bitbuffer_t *bitbuf
     device = value >> 12;
 
     temp_raw = value & 0xfff;
-    temp_c = (temp_raw - 200) / 10.;
+    temp_c = (temp_raw - 200) * 0.1f;
 
     data = data_make(
             "model",         "",            DATA_STRING, _X("Thermopro-TP11","Thermopro TP11 Thermometer"),
diff --git a/src/devices/wt0124.c b/src/devices/wt0124.c
index 567c4c462..8206373b9 100644
--- a/src/devices/wt0124.c
+++ b/src/devices/wt0124.c
@@ -60,7 +60,7 @@ static int wt1024_callback(r_device *decoder, bitbuffer_t *bitbuffer)
     sensor_rid = (b[0]&0x0F)<<4 | (b[1]&0x0F);
 
     /* Get temperature */
-    temp_c = (float) ((((b[1]&0xF)<<8) | b[2])-0x990) / 10.0;
+    temp_c = ((((b[1] & 0xF) << 8) | b[2]) - 0x990) * 0.1f;
 
     /* Get channel */
     channel = ((b[3]>>4) & 0x3);
diff --git a/src/r_util.c b/src/r_util.c
index 0fa225bba..85eb32201 100644
--- a/src/r_util.c
+++ b/src/r_util.c
@@ -90,57 +90,57 @@ char *sample_pos_str(float sample_file_pos, char *buf)
 
 float celsius2fahrenheit(float celsius)
 {
-  return celsius * 9 / 5 + 32;
+  return celsius * (9.0f / 5.0f) + 32;
 }
 
 
 float fahrenheit2celsius(float fahrenheit)
 {
-    return (fahrenheit - 32) / 1.8;
+    return (fahrenheit - 32) * (5.0f / 9.0f);
 }
 
 
 float kmph2mph(float kmph)
 {
-    return kmph / 1.609344;
+    return kmph * (1.0f / 1.609344f);
 }
 
 float mph2kmph(float mph)
 {
-    return mph * 1.609344;
+    return mph * 1.609344f;
 }
 
 
 float mm2inch(float mm)
 {
-    return mm * 0.039370;
+    return mm * 0.039370f;
 }
 
 float inch2mm(float inch)
 {
-    return inch / 0.039370;
+    return inch * 25.4f;
 }
 
 
 float kpa2psi(float kpa)
 {
-    return kpa / 6.89475729;
+    return kpa * (1.0f / 6.89475729f);
 }
 
 float psi2kpa(float psi)
 {
-    return psi * 6.89475729;
+    return psi * 6.89475729f;
 }
 
 
 float hpa2inhg(float hpa)
 {
-    return hpa / 33.8639;
+    return hpa * (1.0f / 33.8639f);
 }
 
 float inhg2hpa(float inhg)
 {
-    return inhg * 33.8639;
+    return inhg * 33.8639f;
 }