Electrical conversions · FREE TOOL

Watt-Hours to Amp-Hours Calculator

Convert Wh to Ah, Ah to Wh, or kWh to Ah at a specified nominal voltage, in one bidirectional converter.

1

Your inputs

Edit the example
Wh
V

Use the nominal rating on the battery, not its charging voltage.

Example estimate · editable inputs

Converted capacity

83.33 Ah

Uses the nominal voltage you entered. Actual battery voltage changes during use.

BEHIND THE RESULT

How the calculation works

Ah = Wh ÷ V. Wh = Ah × V. 1 kWh = 1,000 Wh.

Compare batteries in Wh when their voltages differ. A higher Ah rating alone does not always mean more energy.

A worked example

1,000 Wh at 12 V is approximately 83.33 Ah. In the other direction, 100 Ah at 12 V is 1,200 Wh.

What this estimate can’t tell you

Uses nominal voltage. Actual terminal voltage varies with chemistry, state of charge and load.

Sources & methodology

Formulas are derived from the units shown. Read our methodology or report a correction. Sources reviewed 2026-11-01.