Ohms Law Calculator
V = I times R — solve for any of the three
Enter any 2 values — the others compute automatically
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Ohms Law calculator
V = I × R. Enter any 2 values, solve for the other 2.
How to use this tool
- 1
Enter any 2 values
Voltage (V), Current (I), Resistance (R), or Power (P).
- 2
See the other 2
Computed instantly using Ohms Law.
- 3
Verify formulas
Shows calculation steps.
Frequently Asked Questions
What is Ohms Law?
V = I × R. Voltage equals current times resistance. Power adds: P = V × I = I² × R = V²/R.
When to use it
Electronics design, PCB layout, LED current limiting, speaker impedance, battery life estimation.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.