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Electrical Load Estimate

Estimate project electrical loads.

Electrical Design SuiteStep 1 of 6

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Early-stage projects need a defensible load figure before the detailed schedules exist. This Professional calculator assembles one from inputs you control: area × load density gives the connected load, additional loads are added, diversity reduces it to a demand load, spare capacity is applied, and power factor converts the result to kVA for transformer or generator discussions.

Method and assumptions

  • Connected (kW) = area × density ÷ 1000 + additional
  • Demand (kW) = connected × diversity%
  • Demand + spare (kW) = demand × (1 + spare%)
  • Demand (kVA) = demand+spare ÷ PF
  • Load density, diversity factor and power factor are user-entered from the project's own load study or governing code.
  • A preliminary decision-support estimate: the result does not replace an approved design calculation or review by a competent authority.
  • All percentages and inputs are user-defined; the calculation is purely arithmetic and assumes no particular code or specification.

Frequently asked questions

Where does the load density come from?
From your own load study or the governing requirement for the building type. The engine stores no W/m² table and applies no default figure on your behalf.
How are diversity and spare capacity applied?
Diversity is a percentage of the connected load, and spare capacity is then added on top of that demand figure, so the two never compound in the wrong order.
Can it replace a design load schedule?
No. It is a preliminary decision-support estimate. Final distribution, protection and sizing must come from an approved design reviewed by a competent engineer.
Why does the tool need power factor?
Because supply equipment is rated in kVA. The demand in kW is divided by the power factor you enter to express the same load in kVA.
Is this calculator free?
It sits in the Professional level. The method and inputs are documented openly here so you can judge the fit before unlocking it.

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