Power, energy & time calculator
Solve for any one variable in power = energy ÷ time. Enter the other two quantities in the stated SI units.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Solve for | Choose the applicable option: Power (W), Energy (J), Time (s). |
| Power (W) | Enter power in W; use the same basis as the other measurements. |
| Energy (J) | Enter energy in J; use the same basis as the other measurements. |
| Time (s) | Enter time in s; use the same basis as the other measurements. |
Understanding your result
Read Solved value in the units and model stated on this page. The formula power = energy ÷ time defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
How much power corresponds to an energy amount over time?
Choose the unknown quantity. The relationship gives average power across the entered time interval, or the corresponding energy or duration.
Common uses
- Find average power from energy and elapsed time.
- Find energy from average power and duration.
How it works
Choose the unknown variable and supply the other two values. The unknown field is ignored. power = energy ÷ time. Division by zero is not defined. These relationships assume consistent quantities and units, without additional physical effects.
Worked example
Energy = 10 and Time = 5 gives power = 2.