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Generator Size Calculator

Enter your running load and your biggest motor to find a suitable generator and the fuel it uses.

Enter your details

kW
Use the Electrical Load Calculator for this.
kW
%

SARZAMEEN Tools | Generator Size Calculator

Estimate generated 19 Oct 2026 | https://www.property.candletrack.pro/public/buildcraft/tool/generator-size-calculator

Results

Enter your values and press Calculate. Results will appear here and update as you change inputs.

    Have a qualified electrician confirm the size, changeover switch and earthing before you buy.

    How this calculator works

    • Running kVA = load × (1 + margin) ÷ power factor.
    • The starting surge is allowed to be 1.5 times the generator rating for a few seconds.

    Frequently asked questions

    kW = kVA × power factor. Generators are sold in kVA; most homes have a power factor of about 0.8.

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