3 Phase Motor Amperage Calculator
Estimate full-load current of a three-phase motor from kW, voltage, efficiency and power factor.
Compare Your Options And Get Clear Answers
Estimate full-load current of a three-phase motor from kW, voltage, efficiency and power factor.
3 Phase Motor Amperage Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
3 Quick Guide
Typical values for reference.
| kW | Volts | Efficiency % | Current |
|---|---|---|---|
| 2.2 | 400 | 90 | 4.15 A |
| 7.5 | 400 | 90 | 14.15 A |
| 15 | 400 | 90 | 28.30 A |
| 30 | 400 | 90 | 56.60 A |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
3 Phase Motor Calculator FAQ
Answers to common questions about this calculator.
Divide power by sqrt(3) x voltage x efficiency x power factor, or read the nameplate.
No. Nameplate values and starting current differ.
I = P / (sqrt(3) x V x efficiency x power factor).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.