Ohm's Law Calculator

Solve for Voltage (V), Current (I), Resistance (R), or Power (P). Enter any two known values to calculate the rest.

Formulas used: V = I × R P = V × I I = V / R R = V / I

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Voltage (Volts)
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Current (Amperes)
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Resistance (Ohms)
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Power (Watts)

What is Ohm's Law?

Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) through it, with the constant of proportionality being resistance (R): V = I × R.

Applications

  • Designing electronic circuits for safe operation
  • Calculating resistor values for LED circuits
  • Troubleshooting electrical components
  • Determining power consumption of devices

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