Work & Power Calculator
Calculate work done, power output, force, distance, or time using physics formulas. W = F × d and P = W / t.
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How to use this calculator
W = work (J), F = force (N), d = distance (m), θ = angle between force and displacement, P = power (W), t = time (s).
- 1
Enter the applied force in Newtons and the displacement in metres.
- 2
If the force is not parallel to the motion (e.g., pulling a sled at an angle), enter the angle between force and direction of motion.
- 3
Enter the time for which the force is applied to get power output.
Frequently asked questions
What is the difference between work and energy?
Work is the process of transferring energy by applying a force over a distance. Energy is a stored quantity; work is how energy is transferred. When you do work on an object, you change its energy — kinetic, potential, thermal, etc.
Why does angle matter in the work formula?
Only the component of force in the direction of motion does work. If you push a box horizontally at 100 N but at 30° above horizontal, only 100 × cos(30°) ≈ 86.6 N contributes to moving the box. The vertical component lifts slightly but the box doesn't move vertically.
What is the difference between watts and joules?
Joules measure energy or work (a fixed amount). Watts measure power, which is the rate of doing work: 1 W = 1 J/s. A 60 W light bulb uses 60 joules of energy every second.
Work & Power Calculator — Force, Distance & Time
How to use the work & power
Use this work & power to work done, power output, force, distance, or time using physics formulas. Enter your values above and get your result in seconds. The tool is free, works on all devices, and keeps your data private — nothing is stored or shared.
How the work & power works
The work & power calculator uses standard formulas used in mathematics, science, and engineering. Enter your inputs, and the tool calculates the result instantly in your browser. No server-side processing means your data stays on your device. Results update in real time as you change inputs.
Work in physics vs everyday language
In physics, work requires force AND displacement in the direction of force. Holding a heavy box stationary requires effort but does zero work (no displacement). Carrying a box horizontally also does no work on the box (force is vertical, motion is horizontal) — though you do work against friction.
Power and efficiency
Power tells you how quickly work is done. A 100 W motor can do the same work as a 50 W motor, but in half the time. Efficiency = useful work out / total energy in × 100%. A perfect machine is 100% efficient; real machines lose energy to friction, heat, and sound.
Work & power: how it works
Built on well-established mathematical principles, this tool delivers accurate results for students, researchers, and professionals. Enter your values and get instant clarity without specialist software or manual arithmetic.
Who uses this tool?
Teachers, students, engineers, and data analysts use it to verify calculations, check homework, and solve problems faster. It is intuitive enough for beginners while comprehensive enough for professional use.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →