Power Calculator
Calculate power instantly in your browser — the published formula, worked locally with no data sent anywhere.
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What this tool does
Calculate power instantly in your browser — the published formula, worked locally with no data sent anywhere. P = W/t is the average over the whole interval; P = F·v is the instantaneous rate while that force acts at that velocity. This is the physics power tool — for electrical watts/amps use the electrical calculators.
How to use the Power Calculator
- Enter or select work done (j).
- Enter or select time taken (s).
- Enter or select force for the p = f·v check (n).
- Enter or select velocity at that force (m/s).
- Read the calculated result; change any measurement to compare alternatives.
Formula
average power P = W / t (work over time); instantaneous power at constant force P = F × v. 1 horsepower = 745.7 W.
- workJ
- Work done (J)
- time
- Time taken (s)
- forceN
- Force for the P = F·v check (N)
- velocity
- Velocity at that force (m/s)
P = W/t is the average over the whole interval; P = F·v is the instantaneous rate while that force acts at that velocity. This is the physics power tool — for electrical watts/amps use the electrical calculators.
Worked example
For power calculator, the following measurements illustrate the exact method: Work done (J): 1000; Time taken (s): 10; Force for the P = F·v check (N): 100; Velocity at that force (m/s): 1.
Inputs
- Work done (J)1000
- Time taken (s)10
- Force for the P = F·v check (N)100
- Velocity at that force (m/s)1
Result
- Power (W)100
- Power (horsepower)0.13
- Power (kW)0.1
- P = F·v at the entered force & velocity (W)100
Results explained
- Power (W)
- Power (W) from the formula above. P = W/t is the average over the whole interval; P = F·v is the instantaneous rate while that force acts at that velocity. This is the physics power tool — for electrical watts/amps use the electrical calculators.
- Power (horsepower)
- Power (horsepower) from the formula above. P = W/t is the average over the whole interval; P = F·v is the instantaneous rate while that force acts at that velocity. This is the physics power tool — for electrical watts/amps use the electrical calculators.
- Power (kW)
- Power (kW) from the formula above. P = W/t is the average over the whole interval; P = F·v is the instantaneous rate while that force acts at that velocity. This is the physics power tool — for electrical watts/amps use the electrical calculators.
- P = F·v at the entered force & velocity (W)
- P = F·v at the entered force & velocity (W) from the formula above. P = W/t is the average over the whole interval; P = F·v is the instantaneous rate while that force acts at that velocity. This is the physics power tool — for electrical watts/amps use the electrical calculators.
Frequently asked questions
average power P = W / t (work over time); instantaneous power at constant force P = F × v. 1 horsepower = 745.7 W.
P = W/t is the average over the whole interval; P = F·v is the instantaneous rate while that force acts at that velocity. This is the physics power tool — for electrical watts/amps use the electrical calculators.
Every field is labelled with its unit — enter values in exactly the labelled unit and read the result in the labelled output unit. Fields with a unit symbol also support the site-wide imperial/metric switch, which converts before the formula runs.
It uses double-precision arithmetic and the published constants and formulas named on this page. The last displayed digit may be rounded, and real conditions can differ from the idealized model described in the assumptions.
Yes. Every calculation runs entirely in your browser; nothing you enter is uploaded, stored or shared.