How to Convert Milliamp-Hours to Watt-Hours
Milliamp-hours, abbreviated mAh or mA·h, are a measure of electric charge. They are most often used to measure the electrical charge of a battery.
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Watt-hours, expressed as Wh or W·h, are a measure of electrical energy. Wh are usually used to measure the energy consumption of a circuit or appliance.
The conversion from electric charge to energy requires the voltage and can be done using the formula below.
mAh to Wh Conversion Formula
Wh = (mAh × V) ÷ 1,000
Thus, the energy in watt-hours is equal to the charge in milliamp-hours times the voltage, then divided by 1,000.
For example, convert the charge used by the average C battery, which is 8,000 mAh at 1.5 V, to Wh.
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Wh = (8,000 mAh × 1.5 V) ÷ 1,000Wh = 12,000 ÷ 1,000Wh = 12 Wh
Common Battery Charge to Energy Conversions
| AA | 2,700 mAh | 4.05 Wh | 1.5 V |
| AAA | 1,200 mAh | 1.8 Wh | 1.5 V |
| AAAA | 625 mAh | 0.9375 Wh | 1.5 V |
| C | 8,000 mAh | 12 Wh | 1.5 V |
| D | 12,000 mAh | 18 Wh | 1.5 V |
| 9V | 565 mAh | 5.085 Wh | 9 V |
Try converting amp-hours to kilowatt-hours.
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