Ohm's Law Calculator

Enter any two values to compute the remaining electrical quantities.

Formulas

  • V = I × R
  • P = V × I = I²R = V²/R
  • I = V / R
  • R = V / I

How to Use

  1. Enter any two known values (e.g., V and R)
  2. Click Calculate to compute the remaining values
  3. Check units and ranges for realistic results

Notes

  • Ideal DC relations; AC circuits require reactance/impedance
  • Power ratings of components must not be exceeded