Ohm's Law Calculator
Fill in any two fields — the other two are calculated automatically.
Enter values in exactly 2 fields (leave the others blank).
Ohm's Law Formulas
VoltageV = I × R
VoltageV = P / I
VoltageV = √(P × R)
CurrentI = V / R
CurrentI = P / V
CurrentI = √(P / R)
ResistanceR = V / I
ResistanceR = V² / P
ResistanceR = P / I²
PowerP = V × I
PowerP = I² × R
PowerP = V² / R
┌──[R]──┐
│ │
[V] [I→]
│ │
└───────┘
V=IR P=IV P=I²R P=V²/R