Calculate the real power actually converted into useful work in an AC circuit.
Real power is what the energy meter records and what performs work. The √3 factor appears in three-phase because line voltage exceeds phase voltage by that ratio in a star connection. Forgetting the √3 factor understates three-phase power by 42 per cent, which is a common and expensive sizing error.
Real Power
P = V I cos φ single phase; P = √3 V I cos φ three phase
P = V I cos φ single phase; P = √3 V I cos φ three phase Real power is what the energy meter records and what performs work. The √3 factor appears in three-phase because line voltage exceeds phase voltage by that ratio in a star connection.
Forgetting the √3 factor understates three-phase power by 42 per cent, which is a common and expensive sizing error.
This calculator takes 4 inputs: RMS voltage, RMS current, Power factor, Phases. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.