Ohm’s Law Calculator Ohm’s Law Calculator – Free Online Tool for Voltage, Current & Resistance Ohm’s Law Calculator Instantly Calculate Voltage, Current, or Resistance Enter Any Two Values First Value Second Value What do you want to calculate? Voltage (V = I × R) Current (I = V ÷ R) Resistance (R = V ÷ I) Calculate Visit Another Calculator — Two-Wheeler Loan Calculator