wh to mah calculator
Wh to mAh Calculator
Convert a battery's watt-hour rating into milliamp-hours when you need to compare power banks, labels, or airline capacity limits.
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Voltage presets
Use the voltage printed on the battery label when available. mAh without voltage cannot be compared fairly.
Converted capacity
27,027 mAhmAh = Wh x 1000 / volts
Watt-hours100 Wh
Amp-hours27.03 Ah
Milliamp-hours27,027 mAh
Voltage3.7 V
Travel check: At or below 100 Wh, lithium-ion spare batteries are within the standard FAA PackSafe size limit, but airline, route, and damage-protection rules still apply. Check the FAA PackSafe lithium battery page and your airline before flying with spare batteries or power banks.
Formula
mAh = Wh x 1000 / V. For example, 100 Wh at 3.7 V is about 27,027 mAh.