Electrical calculator
Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's law.
How the calculation works
V = I × R, I = V ÷ R, R = V ÷ I. Power = V × I.
Example: 12V and 4Ω = 3A and 36W.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, medical circumstances, structural requirements, or other project-specific factors unless explicitly stated.
Frequently asked questions
How accurate is the Ohm's law calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.