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Kilowatts to Amps Calculator
Who it's for: Electricians, service technicians, and estimators.
Calculator Inputs
Quick Summary
- Built for: Electricians, service technicians, and estimators.
- Key outputs: Estimated amps, Equation used, and more.
- Use this page for early planning estimates before final code and manufacturer verification.
Inputs
- Kilowatts (kW)
- Voltage (V)
- Phase (single/three)
- Power factor
Outputs
- Estimated amps
- Equation used
- Phase and PF notes
How this calculator estimates results
- Converts kW to watts and applies phase-specific current formulas.
- Uses single-phase or three-phase denominator terms based on selected phase.
- Applies user-selected power factor to produce an estimated current value.
Cross-check assumptions with Breaker Size Calculator for a more complete planning workflow.
Common ranges and tips
- Use measured system voltage under expected operating conditions.
- When power factor is unknown, start with conservative assumptions and validate.
- Use the Breaker Size Calculator page for planning guidance before final code checks.
Related Calculators
FAQ
Yes. Three-phase current uses a different equation than single-phase and can significantly change estimated amperage.
Use equipment data when available; if unknown, use a planning assumption and verify with measured or manufacturer values.
No. Treat this as a starting estimate and complete final sizing with code tables, equipment nameplates, and engineering judgment.
Disclaimer: Use results for planning only. Final design and installation decisions must follow local code and manufacturer documentation.
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