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Ohm's Law Calculator

Calculate voltage, current, or resistance using Ohm's Law. Enter any two values to find the third, plus power.

Formula

V = I × R

V
Voltage, in volts
I
Current, in amps
R
Resistance, in ohms

What this calculator does

Solves for voltage, current, or resistance when the other two are known, and reports power. Enter exactly two values.

Use cases

  • Check a circuit's expected current draw before energizing it
  • Find the resistance of a load from a voltage and current reading
  • Verify a multimeter reading against the expected calculation

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