UPS Sizing Calculator
Estimate recommended VA rating and battery Wh from load, target runtime, power factor and efficiency.
Get a conservative first-pass estimate for UPS selection before checking the manufacturer runtime curves.
Use the tool
————This is a first-pass estimate. Real UPS runtime depends on battery chemistry, discharge curve, age, temperature and the manufacturer model. Always validate against the vendor runtime chart.
Use the result with confidence
Recommended workflow
- Use measured or documented input values and consistent units.
- Calculate a baseline, then add redundancy, peak-load and growth margins where relevant.
- Validate the result against the real environment before changing production.
What to verify
- Confirm the scope, units and input values before interpreting the output.
- Separate the observed result from the operational decision that follows from it.
- Validate the conclusion against the real target system, logs or configuration before changing production.
Questions about this tool
Which inputs have the greatest effect on UPS sizing?
Use measured or documented values, keep units consistent and include the operational margin that the production environment actually needs.
Is the calculated value a final sizing recommendation?
No. It is a planning baseline; vendor limits, redundancy, peaks, growth and environmental constraints still need to be applied.
How should I validate the result?
Compare it with a real measurement, vendor specification or existing workload before purchasing or changing production capacity.