Power unit converter
Convert power units — watts, kilowatts, megawatts, milliwatts, metric and mechanical horsepower, BTU/h, cal/s, ft·lb/s and refrigeration tons.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Result
The source to target line first, then every common unit.
Enter a power value to convert
Units: 0
What this tool does
- Compare engine output: 1 metric horsepower = 735.49875 W while 1 mechanical horsepower = 745.699872 W.
- Size air conditioning and refrigeration: 1 refrigeration ton = 12000 BTU/h ≈ 3516.85 W of cooling.
- Read US appliance plates: 1 BTU/h ≈ 0.293 W.
Example
Input
1
Output
瓦 (W) → 公制马力 (PS)：1 W = 0.00136 PS 毫瓦 (mW) = 1000 mW 瓦 (W) = 1 W 千瓦 (kW) = 0.001 kW 兆瓦 (MW) = 0.000001 MW 公制马力 (PS) = 0.00136 PS 英制马力 (hp) = 0.001341 hp 英热单位每小时 (BTU/h) = 3.412142 BTU/h 卡每秒 (cal/s) = 0.239006 cal/s 英尺磅每秒 (ft·lb/s) = 0.737562 ft·lb/s 冷吨（美制冷吨） (RT) = 0.000284 RT
1 metric horsepower = 735.49875 W and 1 mechanical horsepower = 745.6998715822702 W — about 1.4% apart.
Frequently asked questions
How different are metric and mechanical horsepower?
Metric horsepower (PS) is 735.49875 W and mechanical horsepower (hp) 745.6998715822702 W — about 1.4% apart. European specs usually quote PS, US specs hp.
Is a refrigeration ton a power unit?
It is a cooling-capacity equivalent: 1 ton = 12000 BTU/h = 3516.8528420667 W of cooling. It is not the compressor electrical input, which is typically about a third of it.
How is BTU/h converted to watts?
1 BTU = 1055.05585262 J, so 1 BTU/h = 1055.05585262 ÷ 3600 ≈ 0.29307107017222 W — an exact derivation.
What precision is used?
Number(value.toFixed(6)): 1 mechanical horsepower prints as 745.699872 W, with the full factor shown on the page.
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