kW to Volts Calculator - Voltage from Power and Current

Agarapu Ramesh — Editor and content reviewer
Editorially reviewed Reviewed by Agarapu Ramesh, science educator (chemistry). LinkedIn
Last reviewed: May 2026 | Standard electrical engineering formulas

You cannot get volts from kW alone. You need current too, and for AC you need power factor. This calculator is mainly a reverse check when you know load power and measured amps.

Formula at a glance

  • DC: V = kW x 1000 / A
  • single-phase: V = kW x 1000 / (A x PF)
  • three-phase: V = kW x 1000 / (1.732 x A x PF)

Field note: On a live job, measure voltage directly if you can do it safely. Reverse-calculating voltage is a check, not a substitute for a meter.

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Calculator Tool

Convert kilowatts to voltage

kW
A
Result
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Formula

V = (kW × 1000) / A

How to use the kW to Volts Calculator

Use this as a fast electrical check, then compare the result with the nameplate, measured voltage and power factor. The formula is clean. Real panels, motors and UPS loads usually have one extra wrinkle.

Worked example

Example: 5 kW at 20.83 A DC works out to 240 V. At 20.83 A single-phase with PF 0.85, voltage is about 282 V.

Practical checks before you trust the number

  • Current has to be the actual load current, not breaker size.
  • For three-phase, the result is line-to-line voltage.
  • Bad PF assumptions make the voltage answer bad.

Common mistake

On a live job, measure voltage directly if you can do it safely. Reverse-calculating voltage is a check, not a substitute for a meter.

Sources and references

Related calculators

Frequently Asked Questions

Single-phase: V = (kW × 1000) ÷ (A × PF). Three-phase: V = (kW × 1000) ÷ (√3 × A × PF). DC: V = (kW × 1000) ÷ A. Example: 5 kW, 25 A, PF 0.9 single-phase → V = 5000 ÷ (25 × 0.9) = 222 V.

V = (kW × 1000) ÷ (A × PF) for single-phase. Three-phase needs the √3 factor. Use this when checking whether your supply voltage matches the kW and current rating of imported or specified equipment.

V = (kW × 1000) ÷ (A × PF) for single-phase, or V = (kW × 1000) ÷ (√3 × A × PF) for three-phase. Example: 4 kW, 12 A, PF 0.85 single-phase → V = 4000 ÷ (12 × 0.85) = 392 V (probably a wrong assumption — likely three-phase, where V = 4000 ÷ (1.732 × 12 × 0.85) = 226 V).

Three-phase: V_line = (kW × 1000) ÷ (√3 × A × PF). Example: 10 kW, 16 A, PF 0.85 → V_line = 10000 ÷ (1.732 × 16 × 0.85) = 425 V. Use line voltage and line current for consistency.

Use the actual nameplate or measured PF. For motors and inductive loads, 0.7 to 0.9. For heaters (resistive), PF = 1. PF in the denominator means lower PF gives higher calculated voltage — important for verifying supply matches load specs.

Single-phase: V = (5 × 1000) ÷ (20 × PF). At PF 1: V = 250 V. At PF 0.85: V = 294 V. So depending on PF, the required voltage varies. For single-phase 230 V supply: only resistive loads (PF 1) at 5 kW actually work at 20 A — for inductive loads, you'd need higher voltage or current.

Yes. Useful for verifying whether equipment specs match your supply. If the calculated voltage is way off your supply voltage, the equipment was specified for a different region (US 120 V vs Indian 230 V, for instance) and needs a transformer or different model.