Electrical load calculator

Apparent power = watts ÷ power factor. Current = VA ÷ voltage for single phase, or VA ÷ (√3 × line voltage) for balanced three phase.

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Real power load (watts)

Power factor

More inputs and assumptions

Supply voltage (volts)

Supply type: 1 for single phase, 3 for balanced three phase

Answer

…

Apparent power = watts ÷ power factor. Current = VA ÷ voltage for single phase, or VA ÷ (√3 × line voltage) for balanced three phase.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

A steady balanced load at the stated voltage and power factor. Starting surges, harmonics, neutral current, branch-circuit rules and protective-device selection are excluded. This calculates load current; it does not certify a circuit or choose a wire size.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using Electrical load calculator

Apparent power = watts ÷ power factor. Current = VA ÷ voltage for single phase, or VA ÷ (√3 × line voltage) for balanced three phase.

Next: Voltage calculator

Next: Current calculator

A worked example

For real power load (watts) = 3000, power factor = 0.8, supply voltage (volts) = 230, supply type: 1 for single phase, 3 for balanced three phase = 1, load current (amps) = 16.304348.

Before you use the result

Example results for real power load (watts)

These examples use Power factor: 0.8; Supply voltage (volts): 230; Supply type: 1 for single phase, 3 for balanced three phase: 1. They are reference calculations, not recommended settings.

Real power load (watts)	Load current (amps)
1500	8.152174
3000	16.304348
6000	32.608696

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