Electric Motors
Three-Phase Motor Current Calculator
Three-Phase Motor Current converts the entered electrical measurements into line current. Use it to the line current calculation.
Enter values for line current
Use one consistent electrical operating case for all fields.
How Three-Phase Motor Current works
This worksheet evaluates I = P ÷ (√3 × V × PF). Three-Phase Motor Current uses Real input power, Voltage-factor product to report Line current. Continue to VFD Motor Speed Calculator for estimated motor speed.
With the loaded values, line current evaluates to 24.60 A. Hold the remaining entries steady while testing an uncertain input.
Inputs for Three-Phase Motor Current
Real input power and Voltage-factor product belong to Three-Phase Motor Current. Keep source units with real input power.
The sample case is a worked example, not a design target. Use Motor Energy Consumption Calculator.
- Real input power
- Example entry: 15000 W.
- Voltage-factor product
- Example entry: 609.7 V.
Reading the Three-Phase Motor Current result
This output represents Three-Phase Motor Current.
Compare the output with equipment limits and the applicable design margins.
Measurement and units
Motor nameplate data, duty, enclosure, starting method, load profile, and thermal limits govern final selection. Check prefixes on real input power.
Do not compare cases built from different unit prefixes or measurement locations.
Limits of this calculation
Use actual efficiency and power factor in the denominator.
Only the stated inputs participate in this simplified model. Unentered effects remain outside Three-Phase Motor Current.
Questions about Three-Phase Motor Current
What does Three-Phase Motor Current calculate?
Three-Phase Motor Current reports line current.
Can Real input power be zero?
For Three-Phase Motor Current, measure any zero real input power directly.
Why can line current differ from measurement?
Use actual efficiency and power factor in the denominator. Recheck real input power.
Should the result be rounded?
Keep extra digits while comparing cases, then round to the precision supported by real input power.