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Battery

Battery Energy Calculator

Calculate battery energy in watt-hours from amp-hours and voltage.

CapacityAh

VoltageV

Stored energy

Enter Ah and voltage

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About Battery Energy Calculator

Battery energy formula

Watt-hours = amp-hours × voltage: Wh = Ah × V. A 100 Ah 12 V battery stores 1,200 Wh (1.2 kWh).

Compare packs fairly

Wh is the best metric for comparing different voltages. Use Battery Runtime once you know load watts.

Frequently asked questions

Q: Is this the usable energy? A: No—usable energy depends on depth of discharge and chemistry. See the DoD calculator.

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