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

Convert watt-hours to milliamp-hours by entering the energy in watt-hours and voltage below.


Milliamp-Hours Results:

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How to Convert Watt-Hours to Milliamp-Hours

Watt-hours, expressed Wh or W·h, are used to measure energy in an electrical circuit. 1 watt-hour is equal to one watt of energy consumed for one hour of time.

Milliamp-hours, shortened as mAh or mA·h, are a measure of electrical charge. They’re often used to measure the charge of a battery, for example. A one mAh charge can supply one milliamp of current for one hour.

To convert from energy to electrical charge, the formula below can be used, in conjunction with the voltage.

Wh to mAh Conversion Formula

mAh = (Wh × 1,000) ÷ V

The charge in milliamp-hours is equal to the watt-hours times 1,000, then divided by the voltage.

For example, let’s convert 10 Wh at 12 V to mAh.

mAh = (10 Wh × 1,000) ÷ 12 V
mAh = 10,000 ÷ 12 V
mAh = 833.33 mAh

Give our kilowatt-hours to amp-hours calculator a try.