Ohm's Law Calculator
Solve for voltage, current, resistance or power.
Result
Results are estimates for general information only and are not professional advice.
Ohm's Law
Ohm's Law relates voltage, current and resistance: V = I × R. Enter any two values (leave the unknown as 0) and this calculator finds the third along with the power (P = V × I).
Frequently Asked Questions
What is the Ohm's Law Calculator?
Solve for voltage, current, resistance or power. It runs instantly in your browser and is completely free.
Is the Ohm's Law Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Ohm's Law Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.