ChargeEstimateKit

Charger Power Calculator

Calculate charger power in watts and kilowatts from voltage, amperage, and phase selection.

Last reviewed: 2026-06-14

Learn how this estimate is calculated

Estimate

V
A

Estimated result

Power in watts Enter values

Power in kW Enter values

Charging prices and charging speeds vary. Use this as a planning estimate.

Formula

single-phase kW = volts x amps x power factor / 1000
three-phase kW = volts x amps x sqrt(3) x power factor / 1000

Example

A 240 V, 32 A single-phase charger is about 7.68 kW before real-world limits are considered.

Assumptions and limits

  • This calculator is planning math only and is not electrical installation advice.
  • It does not choose breaker size, wire gauge, outlet type, load calculation, permit requirements, continuous-load derating, or code compliance.
  • A qualified electrician should verify circuits, wiring, breakers, codes, permits, and safe charger installation decisions.

FAQ

Can I use this to choose a breaker size?

No. This page only estimates electrical power from voltage and current. Installation decisions require a qualified electrician.