Electrical Calculator
3 Phase Power Calculator for Amps to kW
Use this 3 phase power calculator to convert amps to kW from line voltage, current, and power factor for a balanced three-phase load.
Calculate 3 phase power from line voltage and current
This 3 phase power calculator estimates real power in watts and kW using line voltage, current, and power factor in a balanced three-phase load.
It is useful for quick checks involving motors, industrial loads, panels, and other three-phase equipment where a simple power estimate or amps to kW conversion is needed.
Inputs
Result
How to read the result
The result shows estimated real power for a balanced three-phase load using the values you entered. The watt value is the raw result, and the kilowatt value is the same result converted for easier practical use.
This estimate is most useful for quick load checks and rough comparisons, not for final equipment selection or protection design. If you are trying to convert amps to kW in a three-phase system, this is the relationship you usually need.
Formula
Power (W) = √3 × Voltage (V) × Current (A) × Power Factor
Power (kW) = Power (W) ÷ 1000
Worked example
If line voltage is 380V, current is 10A, and power factor is 0.9:
√3 × 380 × 10 × 0.9 ≈ 5922.28 W
5922.28 W ÷ 1000 ≈ 5.9223 kW
Common 3 phase power examples
380V, 10A, PF 0.9
This setup is about 5.92 kW in a balanced three-phase system.
400V, 20A, PF 0.85
This setup is about 11.78 kW.
415V, 30A, PF 0.9
This setup is about 19.41 kW.
440V, 50A, PF 0.9
This setup is about 34.29 kW in a balanced three-phase system.
Common amps to kW examples in 3 phase systems
How many kW is 10A 3 phase?
It depends on voltage and power factor. At 400V and 0.9 PF, 10A is about 6.24 kW.
How many kW is 20A at 400V 3 phase?
At 400V and 0.85 PF, 20A is about 11.78 kW.
How many kW is 30A at 415V 3 phase?
At 415V and 0.9 PF, 30A is about 19.41 kW.
How many kW is 50A at 440V 3 phase?
At 440V and 0.9 PF, 50A is about 34.29 kW.
Three phase current calculator use cases
Estimating kW from line current
If you know three-phase current and line voltage, this page works like a practical 3 phase current calculator for estimating kW.
Motor current checks
This is useful when a motor or panel value is shown in amps and you want a quick power estimate in watts or kilowatts.
Industrial and workshop loads
Three-phase circuits in workshops, manufacturing, and commercial settings are common places where current-to-power conversion is needed.
When to use this calculator
Motor and machinery checks
Use this calculator when checking three-phase motor loads, machinery ratings, and general industrial power requirements.
Panel and feeder planning
It can help with quick three-phase load estimates before deeper design, protection, or conductor sizing work.
Converting current to power
If you know line voltage and current, this page helps convert amps into estimated watts and kilowatts for balanced three-phase systems.
Important notes
This is a balanced three-phase estimate
This calculator assumes a balanced three-phase system. Unbalanced loads may require different analysis.
This page uses line voltage input
The formula here is based on standard three-phase power calculation using line voltage and line current.
This is not a full system study
Use this for quick estimation only. Final design work may require load analysis, protection review, efficiency assumptions, and equipment data.
FAQ
What is the √3 factor for?
In a balanced three-phase system, √3 is part of the relationship between line voltage and total real power.
Is this calculator for balanced loads?
Yes. This is a simple balanced three-phase power estimate.
Can I use line-to-line voltage here?
Yes. This page assumes line voltage input in a standard three-phase calculation.
How do I convert 3 phase amps to kW?
Use the formula √3 × line voltage × current × power factor, then divide by 1000 to convert watts to kilowatts.
Can this work like a 3 phase current calculator?
Yes. If your goal is to estimate power from known line current, this page can be used as a three-phase current-to-kW calculator.
Is this the same as a three phase power calculation formula?
Yes. This page uses the standard balanced three phase power calculation: √3 × line voltage × current × power factor.
Can I use this for generator sizing?
You can use it for rough load estimation, but final generator sizing should also account for starting current, diversity, and actual load profile.
Why can actual measured power differ from this result?
Real systems may differ because of imbalance, load variation, measurement conditions, harmonics, and equipment characteristics.