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Electrical conversion

Watts to Amps and Amps to Watts Calculator

Choose conversion direction and phase, then enter voltage, power factor, and efficiency to calculate the result and see the applied equation.Start calculating
W / A / kWhPower and currentPDFStandalone reportSBC 401Method reference

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Convert watts to amps or amps to watts for single- and three-phase 230/400 V systems with power factor, efficiency, and displayed formulas.

Calculator

Watt and amp conversion

Single or three phase
Calculation inputsResults update instantly
Conversion
Supply system
Study resultTAYAR TK
Tayar TK
Preliminary engineering studyWatt and amp conversion
Date: 2026-07-23Report reference: KWH-CONVERT-2026

Convert watts to amps

Single-phase calculation including power factor and efficiency.

Calculated current15.26A
Voltage230V
Power factor0.9
Efficiency95%
Calculation method

P = V × I × PF × η

Engineering notes
  • For motors and air conditioners, use nameplate current and MCA/MOCP when available.
Safety approval

Do not use this estimate for installation before checking nameplate data, site conditions, short-circuit protection, and earthing.

kwh.tirtk.com.satirtk.com.saC.R 1009172880

This is a planning and comparison estimate. Final protection and conductor selection requires review by a licensed engineer or electrician, site-condition checks, manufacturer instructions, and the applicable code.

Calculation guide

Why watts divided by volts is not always enough

AC loads include power factor and efficiency. Single phase uses P = V × I × PF × η, while balanced three phase uses P = √3 × V × I × PF × η.

Watts measure real power and amps measure current, so accurate conversion needs voltage, phase, and load power factor. The Saudi starting values of 230 V single phase and 400 V three phase remain editable.

How to convert watts and amps

  1. Choose watts-to-amps or amps-to-watts.
  2. Select single or three phase.
  3. Enter the correct load voltage.
  4. Enter nameplate power factor and efficiency.
  5. Use calculated current in load, cable, and protection studies.

Common conversion mistakes

  • Using 230 V for a 400 V three-phase load.
  • Assuming PF = 1 for motors without data.
  • Confusing cooling capacity with AC electrical input.
  • Selecting a breaker from current alone without cable data.
Method references
SBC 401IEC 60364-5-52

Frequently asked questions

Electrical conversion frequently asked questions

How many amps is 1000 watts?

At 230 V single phase and PF = 1, it is about 4.35 A. The result changes with voltage, power factor, and efficiency.

What changes in three phase?

Balanced three-phase power includes √3 and uses line-to-line voltage, while single phase uses line-to-neutral voltage.

Does an 18,000 BTU AC use 18,000 watts?

No. BTU/h is thermal cooling capacity. Use electrical watts or amps from the nameplate.

Does the result determine cable size?

Current is one input, but cable size also needs route length, installation, temperature, grouping, and voltage drop.