Uninterruptible Power Supply (UPS) Calculator
Calculate the size of UPS you need and estimate how long it will power your devices. Use our tools for accurate and quick calculations.
UPS Size Calculator
Additional UPS Calculators
UPS Runtime Calculator
Battery Capacity Calculator
Frequently Asked Questions
How do I calculate what size UPS I need?
To calculate the size of UPS you need, sum up the total power consumption of all devices you want to connect to the UPS. Divide this value by the UPS efficiency (in decimal form) to get the recommended VA rating.
How do you calculate how long an UPS will last?
To calculate UPS runtime, use the formula: Runtime = (Battery Capacity × Battery Voltage) / Load Power. Multiply the result by 60 to get the runtime in minutes.
How long will a 1000W UPS power a PC for?
The runtime of a 1000W UPS depends on the battery capacity and the load power. For example, if the UPS has a 12V 100Ah battery and the PC consumes 500W, the runtime is approximately 144 minutes.
How long will a 1500VA UPS run?
The runtime of a 1500VA UPS depends on the load and battery capacity. For example, if the UPS has a 12V 100Ah battery and the load is 750W, the runtime is approximately 96 minutes.
Need Help with Calculations or Custom Tools?
If you need assistance with using our calculators, have questions about specific calculations, or require a custom calculation tool tailored to your needs, feel free to reach out. We're here to support you!