Ohm's Law Calculator
Solve voltage, current, resistance and power. Leave one field blank.
Enter any two values and leave the one you want to find blank.
Voltage (V)१२ V
Current (A)३ A
Resistance (Ω)४ Ω
Power (W)३६ W
How to use
Enter your values above and read the result instantly.
How it works
Everything is computed locally in your browser — nothing is uploaded.
Frequently asked questions
Is it free?
Yes, completely free with no limits.
Is my data private?
Yes, all processing happens in your browser.