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mAh to Wh Calculator

Convert battery capacity

mAh
V
Result
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Formula

WhWh = (mAh × V) ÷ 1000

Common Battery Voltages

Battery TypeVoltage
Li-ion/Li-Po3.7V
Li-ion (full)4.2V
NiMH/NiCd1.2V
Alkaline AA1.5V
Lead Acid2V/cell

Related

Wh to mAhElectricity Bill

Understanding mAh vs Wh

mAh (milliamp-hours) measures battery charge capacity, while Wh (watt-hours) measures energy capacity. Wh is more useful for comparing batteries of different voltages.

Why Wh Matters for Travel

Airlines limit lithium batteries to 100Wh for carry-on. A 27,000mAh power bank at 3.7V = 99.9Wh, just under the limit.

Frequently Asked Questions

Multiply mAh by voltage, then divide by 1000: Wh = (mAh × V) ÷ 1000. For example, 10000mAh at 3.7V = 37Wh.

Most airlines allow batteries up to 100Wh in carry-on. Batteries 100-160Wh require airline approval. Above 160Wh is prohibited.