UPS Calculators and Tools

Most UPS mistakes come from three places: adding up nameplate ratings instead of real draw, assuming runtime scales linearly with load, and forgetting that batteries age faster in warm rooms. These tools are built to avoid all three.

Which tool should you start with?

• Buying a UPS: start with the UPS sizing calculator. It builds your load from our device database, adds headroom, and recommends a capacity class, waveform and topology.
• Already own one: use the runtime calculator to see how long it lasts at your load, and the battery life estimator to plan the next replacement.
• Reading spec sheets: the VA to watts converter turns the big number on the box into the number that matters.
• Choosing between topologies: the energy cost calculator shows what an always-on online UPS costs to run compared with a line-interactive one.
• Something is beeping: the UPS alarm decoder translates the sound into a likely cause and the next step.

All calculations run in your browser. Nothing you enter is sent anywhere. For the reasoning behind the models, read UPS runtime explained and UPS battery lifespan.