Ah to Watt Hour Conversion Calculator – Battery Energy | OmniCalculator

Convert amp-hours (Ah) to watt-hours (Wh) for batteries. Enter capacity and voltage to calculate energy.

Ah to Watt-Hour Conversion Calculator

Calculate battery energy (Wh) from capacity (Ah or mAh) and voltage

Battery Capacity

Voltage (V)

Efficiency (%)

Total Energy

18.5 Wh

18.5

kWh

0.0185

Usable

18.5

Decimals:

Device	Voltage	Capacity	Energy
Smartphone	3.7V	4000 mAh	14.8 Wh
Power Bank	3.7V	20000 mAh	74 Wh
Laptop	11.1V	4400 mAh	48.8 Wh
Car Battery	12V	60 Ah	720 Wh

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