What formula converts kVA to amps for single-phase circuits?

For single-phase AC: I(A) = S(kVA) × 1000 / V(V). Multiply the kVA by 1000 to get volt-amperes, then divide by the line-to-neutral voltage.

What formula converts kVA to amps for three-phase circuits?

For three-phase AC: I(A) = S(kVA) × 1000 / (√3 × V(V)). The √3 factor (approximately 1.7321) accounts for the three-phase relationship. The voltage entered should be the line-to-line voltage.

kVA (kilovolt-ampere) is the unit of apparent power in an AC circuit. It represents the total power supplied by the source, combining real power (kW) and reactive power (kVAR). Generators, transformers, and UPS systems are commonly rated in kVA.

How does kVA relate to kW and power factor?

kW = kVA × power factor (PF). For purely resistive loads, PF = 1 and kW equals kVA. For inductive loads such as motors, PF is typically 0.8–0.95, so kW is less than kVA. This calculator finds amperes from kVA, independent of power factor.

Which voltage should I use for three-phase calculations?

Use the line-to-line (phase-to-phase) voltage for three-phase calculations — the voltage measured between any two of the three hot conductors, such as 208 V, 400 V, or 480 V.

Does this apply to DC circuits?

kVA is an AC concept only and does not apply to DC circuits. For DC, use P(W) = I(A) × V(V) and rearrange to I = P / V.

kVA to Amps Calculator

Name: kVA to Amps Calculator
Availability: InStock
Author: Nham Vu

Convert kilovolt-amperes (kVA) to amperes (A) for single-phase or three-phase AC circuits instantly.

Circuit Parameters

Circuit Type

Apparent Power (kVA)

Voltage (V) (line-to-neutral)

Result

Enter values and press Calculate

Formula Reference

Single-Phase AC

A = kVA × 1000 / V

V is line-to-neutral voltage

Three-Phase AC

A = kVA × 1000 / (√3 × V)

V is line-to-line voltage

Result copied!

Summary

Convert kilovolt-amperes (kVA) to amperes (A) for single-phase or three-phase AC circuits instantly.

How it works

Select your circuit type: single-phase AC or three-phase AC.
Enter the apparent power in kilovolt-amperes (kVA).
Enter the voltage in volts (V).
The calculator applies the correct formula and displays the result in amperes.
A breakdown table shows input values, formula used, and the computed result.
Use the Reset button to start a new calculation.

Use cases

Determine wire and conductor sizing based on transformer kVA and voltage.
Select the correct circuit breaker or fuse rating for a given kVA load.
Calculate full-load current of a generator from its kVA nameplate rating.
Specify switchgear and bus bar ampacity for distribution panels.
Verify that existing wiring can handle a new kVA-rated load.
Convert UPS or inverter kVA ratings to expected output current.
Plan electrical service upgrades for commercial and industrial facilities.
Size motor starters and contactors from motor kVA ratings.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu