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Single Phase Load
3 Phase formulae
3 Phase Output
Three Phase Load
Transformer Sizing    


We provide these calculators to assist you in determining the size of generator you require.  They also allow you to convert one unit of electricity measurement to another.

  • 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 = Kilowatts
    kVA = Kilovolt Amps

    I = Ampere or Current
    E = Volts
    P.F. = Power Factor

    Sizing Data - Power Consumption

    Calculating Ampere (I), given kVA.
    1, 2, 3
    = Ampere

    3 Phase Calculations

    Converting kVA to kW
    kVA = kW
    Converting kW to kVA
    kW = kVA

    Converting kW to HP

    kW = HP

    What size generator is needed to start a 3 phase electric motor Direct on Line (DOL) start

    HP of
    = Generator
    kVA Required

    Generator Size Required to Start Motors

    Instructions: You only need to fill in the columns coloured in blue.
    Fill in the HP of the motor(s) in their starting sequence, 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 @ 60Hz)
    1 Phase (240 volt @ 60Hz)

    Starting Sequence Motor HP Start Method
    DOL / StarDelta
    Run Variable Phase Current Starting Value 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*


    *  NOTE the above calculations are an estimate only because other factors such as site conditions, motor efficiencies and line losses are not taken into consideration.

    Home Up Contact Us Contents Safety Emergency Planning C EPA  Regulations Leasing Electricity

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    Telephone: toll free at 1-888-810-4709

    Email:       service@powertogo.ca

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    Last modified: April 17, 2010