Electric Motors
Motor Starting Current Calculator
Motor Starting Current converts the entered electrical measurements into starting current. Use it to the starting current calculation.
Enter values for starting current
Use one consistent electrical operating case for all fields.
How Motor Starting Current works
The example applies Istart = FLA × multiple. Motor Starting Current uses Full-load current, Starting multiple to report Starting current.
With the loaded values, starting current evaluates to 168.00 A. Use separate cases for competing input values.
Inputs for Motor Starting Current
Full-load current and Starting multiple belong to Motor Starting Current. Keep source units with full-load current.
Defaults make the page immediately testable, but they do not describe a universal installation.
- Full-load current
- Example entry: 28 A.
- Starting multiple
- Example entry: 6.
Reading the Motor Starting Current result
This output represents Motor Starting 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 full-load current. Mechanical power can be checked in Horsepower Kilowatt Calculator.
Alternatives should share one documented measurement convention.
Limits of this calculation
The starting method can substantially change the multiple.
Only variables shown in the equation affect the numerical output. Unentered effects remain outside Motor Starting Current. Use Motor Poles Frequency Calculator to a separate required pole count calculation.
A useful Motor Starting Current comparison
Record starting current before testing a different full-load current value.
Document the alternate full-load current source.
Questions about Motor Starting Current
What does Motor Starting Current calculate?
Motor Starting Current reports starting current.