calculators
Power Current Voltage Calculator
Estimate power, voltage, or current for DC, simple resistive loads, single-phase AC, or three-phase AC with optional power factor.
Frequently Asked Questions
How does it work?
Select what you want to calculate, choose the circuit model, then enter the known values. DC uses P = V x I, single-phase AC uses P = V x I x PF, and three-phase AC uses P = sqrt(3) x V x I x PF.
What is power factor?
Power factor is the ratio between active power and apparent power in AC circuits. Use 1 for purely resistive loads or when power factor is unknown.
Is this for detailed electrical design?
No. It is a basic calculation for planning and comparison. Real installations may require local code checks and professional review.