Power Converter (W, kW, hp)
Power calculator: P = W/t. Find power from work or energy and time, in watts, kilowatts or horsepower.
How to use this calculator
- Type the value you want to convert.
- Choose the unit you are converting from and the one you want.
- Read the result, or the full table of equivalent units below.
Power is the rate at which work is done or energy is transferred, P = W/t. One watt is one joule per second.
Convert results to kilowatts or horsepower (1 hp = 745.7 W) to compare engines, motors or athletes.
Conversion formula
1 hp = 0.7457 kW · 1 kW = 1.34102 hp
Common conversions: horsepower (mechanical) → kilowatt
| hp | kW |
|---|---|
| 1 hp | 0.7457 kW |
| 2 hp | 1.4914 kW |
| 5 hp | 3.7285 kW |
| 10 hp | 7.457 kW |
| 20 hp | 14.914 kW |
| 50 hp | 37.285 kW |
| 100 hp | 74.57 kW |
| 1 000 hp | 745.7 kW |
Frequently asked questions
What power do I need to climb 3 m in 5 s weighing 70 kg?
W = m·g·h = 2060 J, so P = 2060/5 = 412 W.
What is the difference between kW and kWh?
kW is power (a rate); kWh is energy: 1 kW used for one hour.