Calculate volt-amps, kVA, watts, amps, voltage, and power factor for single-phase and three-phase electrical loads. This VA calculator helps estimate apparent power and compare it with real power.
Calculate VA:
Enter volts and amps. For single-phase, VA = V × A. For three-phase, VA = √3 × V × A.
Calculate amps:
Enter VA and volts. The calculator rearranges the VA formula to estimate current.
Calculate watts:
Enter VA and power factor. The calculator uses W = VA × PF.
A volt amp calculator helps estimate apparent power for electrical loads, UPS sizing, transformer sizing, generator loads, circuit planning, and AC equipment.
It is especially useful when comparing VA, watts, kVA, amps, voltage, and power factor for single-phase or three-phase loads.
Your result shows estimated volt-amps, kVA, watts, amps, volts, power factor, phase type, energy estimate, and comparison scenarios based on the entered values.
Volt-amps, or VA, measure apparent power. In simple single-phase calculations, VA equals volts multiplied by amps.
Not always. In DC circuits or AC circuits with a power factor of 1, they may be the same. In many AC loads, watts equal VA multiplied by power factor.
Divide volt-amps by 1,000. For example, 5,000 VA equals 5 kVA.
Use VA = √3 × volts × amps. This is commonly used for three-phase electrical systems.