Battery Runtime Calculator
Estimate battery runtime from capacity and device power use.
EXAMPLE RESULT
Estimated runtime per charge
7 h 12 min
- Nominal battery energy
- 600 Wh
- Usable output energy
- 432 Wh
- Constant output-side load
- 60 W
Assumes a constant load and your entered usable capacity and efficiency.
How it works
Runtime is usable output watt-hours divided by device watts. For nominal battery capacity, apply the usable-capacity and efficiency allowances first. If you already know usable output energy, use it directly to avoid counting losses twice.