APPENDIX C: Conversion Factors
Power and Energy
1watt = 3.41BTU/hour
1000BTU/h = 293W
1horsepower = 2544BTU/h
1ton of air conditioning = 12,000 BTU/h
1BTU = 1.0545kJ
1kWh = 3.6 MJ
1BTU = 0.293 071Wh
1horsepower (metric) = 735.498 75W
1horsepower (European electrical) = 736W
1horsepower (imperial electrical) = 746W
1ton of air conditioning = 12,000BTU/h = 12000/3.414W = 3515W
Temperature
temp (K) = temp (°C) + 273.15
temp (°C) = temp (K) − 273.15
temp (°C) = [temp (°F) − 32] ÷ 1.8
temp (°F) = temp (K) × 1.8 − 459.67
temp (°F) = temp (°C) × 1.8 + 32
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