Science & Engineering
Watts, Amps and Volts Calculator
Convert between watts, amperes, and volts for a single-phase load with an explicit power-factor input. The calculator uses watts = volts × amps × power factor. It returns more than one result so you can check the main answer against a useful secondary measure. At a fixed voltage, current rises as real power rises or power factor falls. Three-phase systems, nonlinear loads, startup current, and code sizing need additional calculations.
Educational model only. Use applicable standards, calibrated measurements, and qualified review for safety-critical work.
Calculate and compare
Use the number box for precision or the slider for fast scenario testing.
Scenario results
Current
13.1579 A
Real power divided by volts and power factor.
Apparent power
1,578.9474 VA
Watts divided by power factor.
Equivalent resistance
9.12 Ω
Simple voltage/current comparison.
How the calculation works
Use consistent units and retain full precision until the final display step.
Worked example
Reproduce the displayed scenario, then change one assumption at a time.
Assumptions behind the result
- • Inputs use the units shown beside each control.
- • The displayed formula is applied without hidden market or demographic data.
- • Rounding occurs only for display; calculations keep full numeric precision.
- • At a fixed voltage, current rises as real power rises or power factor falls.
- • Three-phase systems, nonlinear loads, startup current, and code sizing need additional calculations.
Mistakes that change the answer
- • Mixing percentages with decimals or mixing incompatible units.
- • Relying on a rounded intermediate value instead of the full result.
- • Changing several assumptions at once instead of testing real power separately.