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Battery amp-hours to watt-hours chart

This table converts amp-hours to nominal watt-hours at 12V, 24V, and 48V. It does not show usable energy or runtime.

Interactive conversion

Convert battery capacity and energy

Switch between amp-hours and watt-hours using a stated nominal voltage.

Conversion direction

Converted battery energy

Planning estimate
Result
-- Wh

Enter a value and nominal voltage, then convert. The result remains empty until both fields are valid.

Formula: Wh = Ah × V Ah = Wh ÷ V

Scope: Nominal planning estimate using Wh = Ah × V or its inverse. It does not estimate usable energy, runtime, charging, battery chemistry, discharge limits, temperature, or system losses.

Battery capacity in amp-hours converted to nominal watt-hours. Planning estimate.
Capacity (Ah) 12 V (Wh)24 V (Wh)48 V (Wh)
5 60120240
10 120240480
20 240480960
35 4208401,680
50 6001,2002,400
75 9001,8003,600
100 1,2002,4004,800
150 1,8003,6007,200
200 2,4004,8009,600
300 3,6007,20014,400
400 4,8009,60019,200
500 6,00012,00024,000
Sources: SolarMathKit calculation methodology NIST SI units and electrical relationships Reviewed Jul 25, 2026

Assumptions

The calculation uses the stated nominal voltage and Wh = Ah × V. Actual usable energy depends on battery chemistry, discharge limits, temperature, age, and losses.

How the conversion works

Multiply the amp-hour rating by nominal voltage. A 100Ah battery is 1,200Wh at 12V, 2,400Wh at 24V, and 4,800Wh at 48V.

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Questions people ask

How many watt-hours are in a 12V 100Ah battery?

Its nominal energy is 1,200Wh. Usable energy is lower after depth-of-discharge and battery-loss assumptions.

Can I compare batteries by Ah alone?

Only when their voltages match. Convert each battery to Wh or kWh before comparing stored energy.