Three Phase Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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Electrical results can look precise while a unit, operating mode, or component assumption quietly changes the answer. Three Phase Calculator keeps the calculation tied to the quantities on this page, so you can trace the displayed three-phase real power back to the values you entered rather than treating it as a black-box number.

What this calculator does

The Three Phase Calculator turns Connection type, Phase current (Iph), Phase voltage (Vph), Power factor into the page’s Three-phase real power using the circuit or component relationship below. Where the page shows supporting quantities, they come from the same idealized model so you can cross-check the headline rather than reading one isolated number.

How to use it

Start with the fields that actually drive this result: Connection type, Phase current (Iph), Phase voltage (Vph), Power factor. Keep units consistent with the menus beside the fields and avoid mixing values measured under different conditions. Choose star or delta connection before interpreting line versus phase quantities, and enter power factor as a decimal consistent with the load. After calculating, change one input at a time if you are comparing scenarios; that makes cause-and-effect much easier to see.

How the calculation works

The page converts between line and phase quantities according to star or delta connection, then calculates real power as P = 3VphaseIphase·power factor. Equivalent line-form expressions follow from the same connection relationships.

Example

Using the page’s default example (Connection type = star; Phase current (Iph) = 10 A; Phase voltage (Vph) = 230 V; Power factor = 1), the calculator reports Three-phase real power of 6,900 W. Change one driving input at a time and confirm the result moves in the direction predicted by the equation; that is a quick way to catch a unit or mode mistake.

How to interpret the result

Interpret the Three-phase real power as an idealized circuit/component quantity for the exact mode and units entered. Use it to compare designs or check hand calculations, but keep component tolerances, ratings, frequency dependence, and real operating conditions in view before turning the number into a hardware decision.

Limitations and notes

The phase-angle field does not independently change the present result when a numeric power factor is already supplied; the entered power factor drives real-power calculation. Unbalance, harmonics, neutral current, and reactive-power detail are outside this simplified model.