⚡ Power Calculator (P = W/t)
Find power as work divided by time (P = W/t), or solve for the work done or the time taken.
Power P
50 W
Power P = W / t (work ÷ time). Also P = F·v (force × velocity). 1 watt = 1 J/s. 🔒 Computed in your browser.
How the power calculator (p = w/t) works
Power is the rate of doing work: P = W/t, measured in watts (1 W = 1 J/s). Enter any two of power, work and time and the tool solves for the third. Power can also be written P = F·v (force times velocity).
Power is about how fast energy is transferred, not how much. Cross-link: convert between watts and horsepower in the unit converters.
Frequently asked questions
How do I calculate power?
Divide work (or energy) by time: P = W/t. Doing 1000 J in 20 s is 50 W. Enter work and time to compute power.
What is a watt?
The SI unit of power: 1 watt = 1 joule per second. A 60 W bulb uses 60 J of energy every second.
What is the difference between energy and power?
Energy (joules) is the total work done; power (watts) is how quickly it is done. The same job done faster requires more power.
What is P = Fv?
An equivalent form: power equals force times velocity. It’s handy when a constant force moves something at a steady speed, such as a car engine overcoming drag.
How do I convert watts to horsepower?
1 mechanical horsepower ≈ 745.7 watts. Use the power unit converter for exact conversions.