mAh to Wh Calculator

Enter mAh and nominal volts to estimate nominal stored energy in Wh.

Capacity (mAh)

Nominal voltage (V)

—Nominal energy

—Ah

—Joules

—kWh

mAh × 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 mAh to Wh Calculator

Convert battery capacity from milliamp-hours to watt-hours using 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.