This mAh to Wh calculator converts a battery’s milliamp-hour capacity into energy in watt-hours (and kWh) using its voltage. Enter the mAh and voltage above.
Formula
Wh = mAh × V ÷ 1000 kWh = mAh × V ÷ 1,000,000
Example
3000 mAh at 3.7 V: Wh = 3000 × 3.7 ÷ 1000 = 11.1 Wh.
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Frequently Asked Questions
How do I convert mAh to Wh?
Multiply milliamp-hours by the voltage and divide by 1000. A 3000 mAh 3.7 V cell holds 11.1 Wh.
Why do I need voltage?
Milliamp-hours measure charge; multiplying by voltage converts it to energy in watt-hours.
How do I get kWh from mAh?
Divide the watt-hours by 1000, or divide mAh times volts by one million.