About Ohm's Law
This calculator applies Ohm's Law (V = I × R) to determine any of the three electrical parameters when the other two are known. Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage (V), current (I), and resistance (R). This tool is essential for electronics hobbyists, electrical engineers, and students working with circuits to quickly solve for unknown values in their electrical designs.
- Input
- Enter the values and choose the settings shown in the calculator or generator.
- Output
- The result is shown in the work area. Use the copy or download controls provided by this tool.
- Processing
- The current implementation computes this tool's results in your browser. No account is required.
- Limits and behavior
- The selected separators, units and options affect the result. Very large inputs can make the browser slow. This page describes the current implementation, not every possible input combination.
How to use Ohm's Law
- Paste or import your input, or enter values in the available fields.
- Choose settings and check the automatically updated result.
- Copy or download the result using the available controls.
Questions about Ohm's Law
What input does Ohm's Law accept?
Enter the values and choose the settings shown in the calculator or generator.
How do I save the result from Ohm's Law?
The result is shown in the work area. Use the copy or download controls provided by this tool.
What limitations should I know about?
The selected separators, units and options affect the result. Very large inputs can make the browser slow. This page describes the current implementation, not every possible input combination.
Where does processing happen?
The current implementation computes this tool's results in your browser. No account is required.
Implementation notes reviewed: 2026-10-25