How long will your UPS last?

Select your UPS model and connected equipment — estimated runtime and load percentage update instantly.

Est. runtime

—

Load

Battery

0Wh

Load vs. UPS capacity0%

UPS

UPS model — or enter values manually below

Battery capacity (Wh)

UPS rated output (W)

Connected load

Device preset — or enter wattage manually below

Total load (W)

Shopping for a UPS? APC and CyberPower are the go-to brands for small and mid-size deployments — look for the Wh rating (not just VA) to compare real runtime across models. See UPS units on Amazon →

Runtime estimates assume ~90% inverter efficiency and a fully charged battery at 20°C. Actual runtime varies with battery age, temperature, and load type.