Wh to mAh Calculator

Enter Wh and nominal volts to calculate the equivalent mAh capacity.

Energy (Wh)

Nominal voltage (V)

—Equivalent capacity at the selected nominal voltage

—Ah

—Joules

—kWh

Wh ÷ V × 1000Formula

Educational / low-voltage electronics calculator. Real components have tolerances and non-ideal behavior. Do not use this page as a substitute for qualified design or safety guidance for mains/high-energy electrical systems.

How to use this Wh to mAh Calculator

Convert watt-hours to milliamp-hours at a chosen nominal voltage. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.