You can't "calculate" it...
UPS = Uninterruptible Power Supply
Uninterruptible Power Supply
An (UPS) Uninterruptible power supply
Uninterruptible Power Supply
UPS (uninterruptible power supply)
uninterruptible power supply
As long as the UPS has power. UPS's have different run times.
UPS (uninterruptible power supply)
the ups was invented by the great american christopher latthem
Uninterruptible supply
Give you time to shut down if you lose your power. Not a replacement for regular back-ups though.
ALU - Arthamatica and logical unit ups -uninterruptible power supply