How to use the Battery Energy Calculator
The Formula
Watt-hours = amp-hours × voltage: Wh = Ah × V. A 100 Ah 12 V battery stores 1,200 Wh (1.2 kWh).
Practical Example
Wh is the best metric for comparing different voltages. Use Battery Runtime once you know load watts.
About Battery Energy Calculator
Battery energy formula
Watt-hours = amp-hours × voltage: Wh = Ah × V. A 100 Ah 12 V battery stores 1,200 Wh (1.2 kWh).
Compare packs fairly
Wh is the best metric for comparing different voltages. Use Battery Runtime once you know load watts.
Frequently asked questions
Q: Is this the usable energy? A: No—usable energy depends on depth of discharge and chemistry. See the DoD calculator.