Physics

Power Factor Calculator

Find power factor from real and apparent power.

Calculated Output

Power factor 0.8

Phase angle (°) 36.87

Formula: PF = real ÷ apparent

Step-by-Step Breakdown

1. Values used:

2. Real power = 800 W

3. Apparent power = 1,000 VA

5. Power factor = Real power / Apparent power = 800 / 1,000 = 0.8

6. Phase angle = 36.87°

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The math behind it

PF = real power ÷ apparent power = cos φ. A PF of 1 is ideal (purely resistive).

800 W of 1000 VA → PF 0.8 (about 36.9°).

Why improve power factor?

A low PF wastes capacity and can incur utility penalties.