Power Calculator (P = W/t)
Calculate mechanical power in Watts and horsepower. Enter work done and time, or force and distance (at constant speed) and time.
How to use this tool
- Enter work done (w), time, force (optional, instead of w) and distance (if using force) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your power and the full breakdown beneath it.
Power is the rate of doing work: P = W/t (Watts = Joules per second). Alternatively P = F·v for constant speed. One horsepower = 745.7 W.
Frequently asked questions
- What is the difference between power and energy?
- Energy (J) is the total amount of work done; power (W) is how fast it is done. A 100 W bulb running for 36,000 s uses 3,600,000 J = 1 kWh.
- How do I convert watts to horsepower?
- Divide watts by 745.7. A 1000 W motor produces about 1.34 hp.