Math & Science
Ohm's Law Calculator
Calculate voltage, current, resistance
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-13
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
What does the Ohm's Law Calculator do?
It helps you calculate voltage, current, resistance.
What inputs do I need?
Enter Voltage, Current, and Resistance.
Are decimals supported?
Yes, you can use decimal values where appropriate.
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About this tool
This Ohm's Law Calculator turns your inputs into practical results. Provide Current, Voltage, and Resistance to calculate Current (A) and Voltage (V).
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.