Amps to kW Calculator
Convert amps to kilowatts or kW to amps for DC, single-phase and three-phase systems. Include voltage, power factor, efficiency, kVA, kVAR, horsepower and energy cost.
Project inputs
Change any value to update the result. Units, boundaries and conditional fields are validated by this calculator’s own engine.
Amps to kW Calculator results
How to use the amps to kW calculator
This amps to kW calculator uses a dedicated engine, live visual and explanations specific to this problem. Review the assumptions before using the output for purchasing, design, grading, pricing or operational decisions.
Use the correct electrical power formula
This amps to kW calculator supports DC, single-phase AC and balanced three-phase AC. DC real power is volts times amps. Single-phase AC includes power factor, while three-phase line power includes the square root of three, line-to-line voltage, current and power factor.
Forward and reverse conversion
Amps-to-kW mode calculates electrical real input from current. kW-to-amps mode rearranges the same system formula. Efficiency is applied separately to estimate usable output, not to reduce the electrical input used for energy billing.
Power triangle outputs
For AC systems, the calculator reports apparent power in kVA and reactive power in kVAR alongside real kW. These values help distinguish conductor and equipment loading from the power converted into useful work.
Electrical safety
Do not size conductors, overcurrent protection, transformers, motors or generators from this conversion alone. National Electrical Code requirements, continuous-load factors, starting current, harmonics, imbalance, temperature, terminals and equipment nameplates must be considered by a qualified professional.
Amps to kW Calculator questions
How many kW is 30 amps at 480 V three phase?
The answer depends on power factor. At 0.90 power factor, balanced three-phase real input is about 22.45 kW.
Why is power factor needed?
AC current can be out of phase with voltage. Power factor identifies the portion of apparent power that becomes real power.
Does motor efficiency belong in the amps-to-kW formula?
Voltage, current and power factor calculate electrical input. Efficiency converts that input to an estimated mechanical or useful output.