0800 301 301



These calculators will assist you in determining what size generator you may require or how to convert one unit of electricity to another.
Please note: All calculations are using 0.8 power factor.

These calculators will calculate:
Amperes when kVA is known
Converting kVA to kW
Converting kW to kVA
Converting kW to HP
kVA Required to run motors
Guide to units:
HP = Horsepower
kW = Kilo Watts
kVA = Kilo Volt Amps
I = Ampere or Current
V = Volts
PF = Power Factor

Phase 1,2,3 Generator
= Ampere

kVA = kW

kW = kVA

kW = HP

HP of motor = Generator
kVA required

Instructions: Add a number in the blue column below.
Enter the HP of the motor(s) in their starting squence, select the start method (Direct On Line or Star Delta) and press Evaluate. The required generator size will then be displayed at the bottom.

3 Phase (415 volt @ 50Hz)
1 Phase (240 volt @ 50Hz)

Starting Sequence Motor HP Start Method
DOL / StarDelta
Phase Current Starting
Total Run Current Total Start Current
1 /
2 /
3 /
4 /
5 /
6 /
Generator Size for Starting with:     kVA*
Generator Size for Running with:     kVA*
  Generator Size Recommended:     kVA*

Please note, this is a guide only – please contact us for exact sizing.