UPS Runtime Calculator
Calculate UPS battery backup runtime based on load and battery capacity
About this calculator
The UPS Runtime Calculator helps determine how long your uninterruptible power supply (UPS) will provide backup power during an outage. By inputting your connected equipment's power consumption and your UPS battery specifications, you can accurately estimate runtime duration. This tool is essential for planning backup power needs, ensuring critical systems stay operational, and selecting the right UPS capacity for your specific requirements.
How to use
Enter your total connected load in watts or VA, then input your UPS battery capacity (amp-hours) and voltage. The calculator will instantly display your estimated backup runtime. Consider factors like battery age and efficiency losses for more accurate real-world estimates.
Frequently asked questions
How accurate are UPS runtime calculations?
Calculations provide estimates within 10-20% accuracy. Actual runtime varies based on battery age, temperature, and load type.
What's the difference between watts and VA?
Watts measure real power consumption, while VA (volt-amperes) represents apparent power. Use watts for more accurate runtime calculations.
How does battery age affect runtime?
Battery capacity decreases over time. Older batteries may provide 50-80% of rated capacity, significantly reducing actual runtime.