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Technology & digital

Watts ↔ kWh calculator

Watts ↔ kWh calculator: mAh measures charge, Wh measures energy.

Your result

Complete the fields and calculate.

Calculation method and formula

Watts × time → kWh: Power or energy × Time period [h] ÷ 1000; kWh ÷ time → watts: Power or energy × 1000 ÷ Time period [h]

Understand the inputs

Direction
Choose the matching option; it determines the table value or calculation variant.
Power or energy
Minimum 0. Use a measured value or your own assumption.
Time period
Unit: Std.. Minimum 0.01. Use a measured value or your own assumption.

Assumptions and limitations

mAh measures charge, Wh measures energy. Voltage is therefore needed for energy comparisons. Efficiency, temperature, aging and charging curves can differ from the constant model.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Direction
Watts × time → kWh
Power or energy
1000
Time period
3 h
Example result3 kWh

Energy = watts × hours ÷ 1,000.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Watts ↔ kWh calculator work?+

Watts × time → kWh: Power or energy × Time period [h] ÷ 1000; kWh ÷ time → watts: Power or energy × 1000 ÷ Time period [h]. mAh measures charge, Wh measures energy. Voltage is therefore needed for energy comparisons. Efficiency, temperature, aging and charging curves can differ from the constant model.

What assumptions should I consider for this result?+

mAh measures charge, Wh measures energy. Voltage is therefore needed for energy comparisons. Efficiency, temperature, aging and charging curves can differ from the constant model. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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