Wattage Calculator
Enter any two values from resistance, current, voltage and power to solve Ohm's law instantly.
Enter exactly two known values. Leave the other fields blank and calculate.
Enter two values to see the load range
Outputs appear after calculation
Your explanation appears here
Calculated values assume ideal DC or RMS AC values and do not include tolerance, inrush current, heat dissipation or wiring limits.
Your checklist appears after calculation
Test how power changes if voltage or current changes while resistance stays the same.
Calculate your baseline first
Enter any two values from resistance, current, voltage and power. The calculator solves the remaining values with Ohm's law and power formulas such as V=IR, P=VI, P=I²R and P=V²/R.
For simple resistive AC loads, use RMS voltage and RMS current. For motors, power supplies and reactive loads, real power can also depend on power factor, so a dedicated AC power-factor calculation may be needed.
Two known values are enough to solve the four core electrical quantities. Entering fewer values is under-defined, while entering more can create conflicting values if the numbers do not satisfy the same circuit relationship.
Results are estimates calculated locally in your browser using ideal Ohm's law relationships. They are for informational purposes only and are not electrical engineering, installation or safety advice. Always follow applicable electrical codes, component ratings and qualified professional guidance before working with mains voltage, batteries or high-power circuits. VisionVix accepts no liability for decisions based on this output.
