Milliamp-Hours (mAh) to Watt-Hours (Wh) Conversion Calculator

Convert milliamp-hours to watt-hours by entering mAh and voltage below.

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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.

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.

Wh = (8,000 mAh × 1.5 V) ÷ 1,000
Wh = 12,000 ÷ 1,000
Wh = 12 Wh

Common Battery Charge to Energy Conversions

Milliamp-hour to watt hour conversions for common battery sizes
Battery Size Capacity (mAh) Energy (Wh) Voltage
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.