FORMULA
Calculation method
Three phase: I = P / (√3 × V × cosφ × η) · Single phase: I = P / (V × cosφ × η)
For a 5 kW, 400 V, three-phase load at 0.80 power factor and 90% efficiency, the calculated current is approximately 10.02 A.
ELECTRICAL CALCULATION
Motor Current Calculator
Calculate approximate operating current for single and three-phase motors or loads using power, voltage, power factor and efficiency.
Motor Current CalculatorVoltage Drop CalculatorCable Size Calculator4–20 mA and 0–10 V CalculatorPump Power CalculatorEnergy Consumption Calculator
CALCULATOR
Current calculation
Calculated current10,02 A
Apparent power (approx.)6,94 kVA
iProvides an approximate value for a balanced load. Starting current, ambient conditions and protection coordination require separate assessment.
FREQUENTLY ASKED
About this calculation
Why can the nameplate current differ?
Manufacturer efficiency, power factor, voltage tolerance and motor design can differ from the theoretical assumptions.
Can I select the breaker and contactor from this current?
It is a starting point. Starting current, utilization category, short-circuit level and protection coordination must also be checked.
ENGINEERING NOTE
Fast calculation, clear assumptions, correct interpretation
The tools are intended for preliminary assessment and checking. Alongside each result, we explain the formula, assumptions and field conditions that require attention.
Prepared by: Neo Kontrol Otomasyon · Last technical review: July 2026
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