Generator Sizing Calculator

Enter values and click on calculate. Result will be displayed.

3 Phase 1 Phase

  Motor Horsepower Direct On Line or
StarDelta 		Starting Value Run Variable Phase Current Total Start Current Total Run Current
1 or
2 or
3 or
4 or
5 or
6 or
7 or

Results:
Generator Size (starting): kVA
Generator Size (running): kVA
Generator Size (recommended): kVA

A Generator Sizing Calculator is a tool used to determine the right size of a generator needed to supply power for specific electrical loads. It helps ensure the generator can handle the total wattage or kilowatt requirements of all devices and systems you want to run without overloading or underutilizing it.

These calculators typically take into account:

Starting and running wattage of devices (some appliances use more power when starting up).
Type of load — resistive (like lights) or inductive (like motors).
Voltage and phase — single-phase or three-phase systems.
Power factor — efficiency of power usage.
By entering these details, the calculator estimates the total power required and suggests the right generator size, usually in kilowatts (kW) or kilovolt-amperes (kVA).