Electrical & Power

UPS Runtime Calculator

Estimate UPS backup runtime from battery specifications and connected load.

Battery voltage (V)

Battery capacity (Ah)

Connected load (W)

UPS efficiency (%)

Results

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Estimated runtime—

How this calculator works

This simplified estimate converts battery capacity to usable watt-hours and divides by the connected load.

Safety note: Electrical calculations are estimates. Follow local codes and manufacturer instructions, and use a qualified electrician for installation or safety-critical work.