Amps to Volts Calculator
Enter known watts, amps, power factor, and phase. Current alone cannot determine voltage without a resistance or power relationship.
Enter known watts, amps, power factor, and phase. Current alone cannot determine voltage without a resistance or power relationship.
A QUICK WALKTHROUGH
How to use this tool
- Choose single-phase or three-phase.
- Enter positive real power, current, and power factor.
- Review the voltage and formula used.
Power relationship
Single-phase uses V = P ÷ (I × PF). Three-phase uses V = P ÷ (√3 × I × PF). Values are magnitudes and power is real watts.
Why amps alone are insufficient
Amps to volts is not a unit-only conversion. Ohm’s law needs resistance (V = I × R), while this calculator instead needs real power and power factor. It does not assume a resistance or a nominal voltage.
Scope and limits
This is an ideal planning estimate. It excludes voltage drop, load variation, harmonics, reactive details beyond PF, wiring ratings, and safety or engineering sign-off. Inputs stay in the browser.
GOOD TO KNOW
Common questions
Can I calculate volts from amps alone?
No. Provide resistance for V = I × R, or provide real power and power factor as this calculator does.
Does it support three-phase?
Yes. Three-phase uses the √3 multiplier; select the system before calculating.
Can I use power factor 1?
Only when that assumption fits the load or is intentionally chosen. Many AC loads need a measured or specified power factor.