UPS Sizing Calculator
Free UPS tool
UPS Sizing Calculator
Enter your connected devices and desired backup time. Get the exact UPS VA rating, watt capacity, and battery runtime recommendation.
Quick add devices
Connected devices
DeviceWatts
Total load0 W
Required VA0 VA
Recommended UPS0 VA
Battery energy needed0 Wh
UPS sizing accounts for power factor and a 25% safety margin. Actual battery runtime varies by UPS model, battery age, temperature, and load profile. Always verify runtime specs in the UPS datasheet.