Battery Capacity Converter – Convert Between mAh, Wh, and Ah
The battery capacity converter converts battery capacity between units: milliamp-hours (mAh), watt-hours (Wh), and amp-hours (Ah). The tool helps compare the actual energy content of different batteries.
Enter the capacity in one unit and the voltage, and the calculator will compute the equivalent value in other units. This is useful for comparing phone, laptop, or electric vehicle batteries with each other.
What's the difference between mAh and Wh?
mAh indicates charge amount but doesn't account for voltage. Wh describes actual energy content and is more comparable across different devices. For example, a 3,000 mAh battery at 3.7 volts equals about 11.1 Wh of energy. Airlines typically allow batteries up to 100 Wh in carry-on luggage.
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Browse all tools →The battery capacity converter converts battery capacity between different units, such as mAh, Wh, and Ah. Useful for electronics enthusiasts and comparing battery devices.
Enter battery capacity and voltage, and the converter calculates capacity in your desired unit.
- Convert milliamp hours (mAh) to watt hours (Wh) and vice versa.
- Voltage information is needed for mAh ↔ Wh conversion.
- Compare the actual energy content of different device batteries.
Watt hours (Wh) indicate the actual energy amount in a battery better than mAh alone.
- The same mAh number at different voltages means different energy amounts.
- Wh is a better unit for comparing batteries across different devices.
- Airlines often limit passenger battery Wh values, making conversion useful.
Actual battery performance depends on many factors beyond just capacity.
- An aged battery's actual capacity may be lower than its nominal capacity.
- Temperature significantly affects battery performance.
- The conversion is mathematically accurate, but actual battery characteristics may vary.