Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to solve the circuit.
Enter Any Two Values
V
A
Ω
W
Fill in any two fields to calculate the rest
Results
Fill in any two fields to calculate the rest
Ohm's Law Formulas
Voltage
V = I × R
V = P / I
V = √(P × R)
Current
I = V / R
I = P / V
I = √(P / R)
Resistance
R = V / I
R = V² / P
R = P / I²
Power
P = V × I
P = V² / R
P = I² × R
Frequently asked questions
What does Ohm's Law Calculator do?
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to solve the circuit.
What should I check in the result?
Check units, rates, dates and assumptions. Compare a simple case by hand before using the result for a decision.