Ohm's Law & Watt's Law Calculator
Enter any two known values and press Calculate below to solve for the remaining values.

Press reset after each calculation
Electrical Properties
  • Electromotive Potential

    Measured in Volts, is represented by the letter V (or E)

  • Current

    Measured in Amperes, is represented with the letter I

  • Resistance

    Measured in Ohms, is represented by the letter R (or the Greek letter Ω)

  • Power

    Measured in watts, is represented by the letter W

Ohm's Law

States the relationship between voltage, current and resistance. Given the relationship between these three elements, once you know any two of them, it is possible to calculate the third.

  • V = IR
    Volts = Amps x Ohms
  • I = V/R
    Amps = Volts / Ohms
  • R = V/I
    Ohms = Volts / Amps
Watt's Law

Watt's Law is similarly useful in figuring out the relationship between power, voltage and current.

  • W = VI
    Watts = Volts x Amps
  • V = W/I
    Volts = Watts / Amps
  • A = W/V
    Amps = Watts / Volts
Ohm's Law Pie Chart
Block ads by default when you upgrade.

🗣️ We value your opinion! Help us make our community even better by participating in our feedback survey. Share your thoughts, suggestions, and ideas to help us shape the future of our community together. Take the survey today!