How to calculate Wh from Ah
The Formula
Watt-hours (Wh) measure total energy stored in a battery. Multiply amp-hours (Ah) by nominal voltage (V): Wh = Ah × V. For example, 100 Ah at 12 V equals 1,200 Wh (1.2 kWh).
Practical Example
A 100 Ah 12 V deep-cycle battery stores 1,200 Wh. Powering a 400 W load from that pack gives roughly 3 hours of runtime at full discharge — though real-world usable capacity is lower once depth of discharge and efficiency losses are accounted for.
About Ah to Wh Converter
Ah to Wh formula
Watt-hours (Wh) measure energy. Multiply amp-hours (Ah) by voltage (V): Wh = Ah × V. For example, a 100 Ah 12 V battery stores 1,200 Wh.
When to use this converter
Use this tool when comparing batteries, sizing solar storage, or matching loads rated in watts to a battery rated in amp-hours.