Electrical · Free Calculator
Amps to kW Calculator
Convert a measured current into real power in kilowatts, for example from a clamp meter reading.
A to kW1 phase and 3 phaseDCClamp meter readings
A
V
cos φ
Real power18.33 kW
Apparent power21.56 kVA
Horsepower equivalent24.58 hp
How this result was calculated
- P = √3 × V × I × pf = 18.33 kW
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Amps to kW Formulas
DC: P = V × I
Single phase: P = V × I × pf
Three phase: P = √3 × VL × I × pf
Single phase: P = V × I × pf
Three phase: P = √3 × VL × I × pf
Worked example
30 A at 415 V three phase, pf 0.85: P = 1.732 × 415 × 30 × 0.85 = 18.3 kW.
Key insight: a clamp meter reads current only. Without a power factor measurement, the kW figure is an estimate; a power analyser gives the true value.
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Frequently Asked Questions
How do I convert amps to kW?
Multiply voltage by current and power factor, and by √3 for three phase, then divide by 1000.
How many kW is 100 A three phase?
At 415 V and pf 0.85, 100 A is about 61 kW.
What power factor should I assume?
Use 1.0 for resistive heaters, about 0.8 to 0.9 for loaded induction motors and the measured value where possible.
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