Amp Hours to kWh Calculator
Convert battery amp-hours to kWh — and back — at any pack voltage. WattSimple goes past the nameplate number to show usable energy after depth of discharge and efficiency, plus runtime for a load you choose.
Nominal energy
1.2 kWh
- Capacity
- 100 Ah
- Usable energy
- 0.91 kWh
Nominal kWh = Ah × volts ÷ 1,000. Usable energy applies your depth of discharge and efficiency — what you actually get out. Lead-acid is typically ~50% DoD; lithium (LiFePO₄) often 80–100%.
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Open converterSources & standards
This tool's methodology and data follow US standards and authoritative public datasets: