Power Converter
Convert power between watts, kilowatts, megawatts, horsepower, BTU/hour, and foot-pounds per second. Useful for electrical engineering, automotive, and HVAC calculations.
Milliwatts (mW)
1000000
Watts (W)
1000
Kilowatts (kW)
1
Megawatts (MW)
0.001
Mechanical horsepower
1.3410221
Metric horsepower
1.3596216
BTU/hour
3412.1416
How to use the power converter
Watts is the SI unit; horsepower exists in two flavors that differ by ~1.4%.
Formula & explanation
Linear scaling through watts.
Examples
100 hp (mech) ≈ 74.57 kW.
Frequently asked questions
- How many watts are in one horsepower?
- 1 mechanical horsepower equals approximately 745.7 watts. Metric horsepower is slightly less at approximately 735.5 watts.
- What is the difference between mechanical and metric horsepower?
- Mechanical (imperial) horsepower equals 745.7 W and is standard in the US. Metric horsepower equals 735.5 W and is used in Europe. They differ by about 1.4%.
- How do I convert kilowatts to horsepower?
- Multiply kilowatts by 1.341 to get mechanical horsepower. For example, 100 kW × 1.341 ≈ 134.1 hp.
- What does BTU/hour measure?
- BTU/hour is a unit of power (energy per time) commonly used for heating and cooling equipment ratings, such as air conditioners.
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