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# Battery backup runtime calculator

Estimate how long a battery bank or UPS will run your load, or size a battery for a target runtime, with depth of discharge and Peukert options.

Enter the bank and the load to see the backup time.

This is a steady-state estimate for one constant load. It does not model temperature, battery age, the inverter's idle draw, BMS cut-off voltage, or how a real load ramps up and down. Peukert's law is an empirical fit for lead-acid style chemistry, not a physical law, and the result is only as good as the datasheet figures you type in. Size critical systems with real headroom; nothing here replaces a commissioning test.
Options

## More unit & math tools

- [Unit converter](/converters/units)
- [Battery test](/device/battery)
[All unit & math tools](/converters)

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