Conversion Factors for Units of Heat Flow Rate
Metric Units British Units
  Watt
(W)		 Calorie per second
(cal/s)		 Kilocalorie per hour
(kcal/hr)		 British thermal unit per hour
(BTh U/hr)
1Watt (W)
 1 0.238 846 0.859 85 3.412 14
 
1 Calorie per second
(cal/s)
 4.186 8 1 3.6 14.286 0
 
1 Kilocalorie per hour
(kcal/hr)
1.163 0.277 778 1 3.968 32
 
1 British thermal unit per hour
(BTh U/hr)
0.293 071 0.069 999 0.251 996 1