IT operations

Ohm's Law Calculator

Calculate any electrical value (V, I, R, or P) when two of the others are known. Use this Networking and IT tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
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Result
Explanation
Common questions
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How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

Ohm's Law: V = I × R. Power: P = V × I = I² × R = V²/R. Enter any two known values to calculate the remaining two.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

What is Ohm's Law?

Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R): V = I × R. It describes the relationship between these three fundamental electrical quantities.