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Battery Capacity Calculator

Convert amp-hours and nominal voltage into watt-hours and kilowatt-hours.

01 / INPUTS

Ah
V

02 / RESULT

NOMINAL ENERGY

1200 Wh

Energy
1200 Wh
Energy
1.2 kWh

Calculation trace

  1. 100 Ah × 12 V = 1,200 Wh
    1200 Wh
    Energy
  2. 1,200 Wh ÷ 1000 = 1.2 kWh
    1.2 kWh
    Kilowatt-hours
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How it works

The tool computes nominal battery energy as E = capacity in ampere-hours × voltage in volts, producing watt-hours. It then divides watt-hours by 1,000 to report kilowatt-hours.

Assumptions & limits

  • Treats the entered voltage and ampere-hour rating as fixed nominal values; it does not model voltage sag or discharge curves.
  • Does not account for efficiency, usable depth of discharge, temperature, ageing or discharge-rate effects.
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FAQ

Why does Ah multiplied by V give Wh?
An ampere-hour is electric charge; multiplying charge capacity by voltage gives energy capacity in watt-hours.
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