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Ohm's Law V-I-R-P Calculator

V=IR; P=VI — voltage, current, resistance, and power.

Solves Ohm's Law for voltage, current, resistance, and power given any two of the four electrical quantities.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

V = I×R; P = V×I = I²×R = V²/R

In depth

Solves Ohm's Law for voltage, current, resistance, and power given any two of the four electrical quantities.