Why we built kVA to kW
Every generator datasheet, transformer nameplate and UPS spec sheet lists capacity in kVA, yet the loads people actually run are measured in kW. The gap between the two — the power factor — is where sizing mistakes happen. We built kVA to kW to close that gap with a converter that is instant, accurate and easy to understand.
Instead of a bare input box, the calculator shows you why the answer is what it is: a live power triangle, a real-versus-reactive power split and an efficiency rating that updates as you type.
What you can do here
- Convert kVA to kW with any power factor from 0 to 1, using typed values, sliders or one-tap presets.
- Reverse the conversion (kW to kVA) for generator and transformer sizing.
- Convert between kVA and amps for single-phase and three-phase systems.
- Look up common values in the conversion chart at 0.80, 0.85, 0.90, 0.95 and 1.00 PF.
- Learn the fundamentals — apparent, real and reactive power, the power triangle and power factor correction.
Our principles
- Free, forever. No sign-up, no paywall and no tracking of the numbers you enter. Calculations run entirely in your browser.
- Show the working. Every result displays the formula and inputs used, so you can check it or copy it into a report.
- Plain language. We explain electrical concepts in clear terms without sacrificing technical accuracy.
- Honest limits. A converter is a starting point. For critical installations, results should be confirmed against manufacturer data and a qualified engineer’s load study.
Who uses kVA to kW
Electrical engineers use it for quick sanity checks during design. Electricians and contractors use it on site when choosing generators. Facility and data-centre managers use it to compare UPS and transformer ratings. Students use the interactive diagrams to build intuition for AC power.
Get in touch
Spotted an error, have a feature request or want to suggest a topic for the blog? We would love to hear from you — visit the contact page.