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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