kVA to kW Calculator

Every generator, transformer and UPS is stamped with two numbers: kVA and kW. One names the capacity the winding can carry, the other the real power the load gets to use. The bridge between them is the power factor.

kVA to kW Calculator converts apparent power into real power at any power factor, reporting the reactive kilovolt-amps alongside, so the whole power triangle is visible when you size equipment.

Everything runs in the browser; nothing is uploaded.

• Convert kVA to kW: At the exact power factor of your load.
• Reactive component: kVAr shown for the missing side of the triangle.
• Load presets: 1.0 resistive, 0.9 electronics, 0.8 classic, 0.7 poor.
• Live formula: kW = kVA x pf, recomputed as you type.
• Export: Copy or download as text, CSV or JSON.
• Learning guide: Why the kVA rating is not the kW you get.

1. Enter the apparent power in kVA.
2. Select or enter the power factor — 0.8 for mixed loads.
3. Read the real power in kW and reactive power in kVAr.
4. Compare the kW against the real demand to check sizing.
5. Export the conversion if needed.

Example 1 — Generator at 0.8. A 100 kVA set delivers 80 kW of real load capacity.

Example 2 — Transformer 0.9. A 630 kVA transformer at 0.9 pf serves 567 kW.

Example 3 — UPS 0.9. A 60 kVA UPS supports 54 kW of IT equipment.

Example 4 — Motor-heavy plant. 250 kVA at 0.75 pf is only 187.5 kW usable — the pf is the sizing trap.

• Right capacity call: Know what a kVA rating truly delivers in kW.
• Full triangle: kW, kVAr and pf together, not just one answer.
• Explained maths: The formula line shows the conversion being made.
• Export ready: Text, CSV and JSON for equipment sheets.
• Free and private: No uploads, no accounts, no logging.