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Electrical Power CalculatorsThe following calculators are provided to help you determine the size of generator required for your specificapplication. Other calculators on this page are for unit conversions and other power related calculations.

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Calculation

Power Calculator

Converting kVA to kW

Converting kW to kVA

Converting kW to HP

Amperes when kVA is known

kVA Required to run motors

Guide to Standard Uints

Kilo Volt Amperes kVA

KiloWatts (1000 watts = 1 kW) kW

Ampere (Volt-Amperes or Current) I

Volts E

Power Factor PE

Percent Efficiency %EFF

Horse Power HP

Power Requirement Calculator

PhaseVolts Required

VAmperes

IPowerFactor =

PowerkW

1

3240 25

.8

1.0EvaluateEvaluateEvaluateEvaluate 4.8

Converting kW to kVA

kW = kVA

1 EvaluateEvaluateEvaluateEvaluate 1.25

Converting kVA to kW

kVA = kW

1 EvaluateEvaluateEvaluateEvaluate 0.8

Converting kW to HP

kW = HP

50 EvaluateEvaluateEvaluateEvaluate

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

HP ofMotor =

GeneratorkVA Required

85 EvaluateEvaluateEvaluateEvaluate

Calculating Amperes (when you know kVA)

Phase1,2,3

GeneratorkVA

VoltsRequired =

AmpereI

1 20 240 EvaluateEvaluateEvaluateEvaluate 83.33333333333333

* LEGAL DISCLAIMER: Whenever complex electrical calculations are involved, it is always wise to seek the

assistance of a certified electrician. The calculators on this page are offered to assist in generating general

estimations only. In most instances, there are numerous additional factors that should be accounted for (such

as altitude, site conditions, iron losses, motor efficiencies, etc.). If you are still unsure or would like assistance

analyzing your current situation, feel free to contact us with your questions.

Other Useful Tools & Information

Chart with Standard Electrical Formulas

Chart of Approximate Generator Fuel Consumption

Article on How to Size a Generator

If you have questions, already know your requirements, or are interested in purchasing please contact us or

browse our extensive inventory of New Surplus Generators and Used Generator Sets to find a standby or prime

power genset to meet your needs.

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