Wh ↔ Ah Converter
Electrical
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Inputs
Formula
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What this converter does
This converter turns ampere-hours into watt-hours and back. Since energy equals charge times voltage, enter the battery voltage — 12 V by default. Type a value and read the result as you type.
Reporting a battery bank in Wh makes different-voltage packs directly comparable, which Ah alone cannot do.
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The units it covers
Energy (Wh) and charge (Ah) are linked by the battery voltage — energy is charge times voltage.
View all units & their values
| Unit | Symbol | Value | Mainly used |
|---|---|---|---|
| Watt-hour | Wh | energy | Battery energy capacity |
| Ampere-hour | Ah | charge | Battery charge rating |
| Voltage | V | input | Nominal battery voltage |
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The formula
Energy equals charge times voltage, so watt-hours and ampere-hours relate through the voltage:
Conversion
Wh = Ah × VWhere:
- Wh = energy in watt-hours
- Ah = charge in ampere-hours
- V = nominal battery voltage
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Worked example
Convert 100 Ah at 12 V to Wh.
Step 1 · The formula
Wh = Ah × VStep 2 · Substitute
100 × 12 = 1,200 WhSo a 100 Ah battery at 12 V stores 1,200 Wh (1.2 kWh).
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The units in this example
Ampere-hoursymbol: Ah
A unit of electric charge — the common capacity rating for lead-acid, solar and EV cells.
Common battery values
- 1 Ah = 1,000 mAh
- Wh = Ah × V
- 100 Ah @12V = 1,200 Wh
- Ah = Wh ÷ V
Watt-hoursymbol: Wh
A unit of energy — the true stored capacity of a battery, independent of voltage.
Common battery values
- 1 Wh = 0.001 kWh
- Wh = Ah × V
- 1,200 Wh = 1.2 kWh
- Wh ÷ V = Ah
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FAQ
QHow do I convert Ah to Wh?
Multiply ampere-hours by the voltage. 100 Ah at 12 V is 1,200 Wh.
QWhat is 100Ah in watt-hours?
At 12 V it is 1,200 Wh; at 24 V it is 2,400 Wh — voltage sets the energy.
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