Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's law (V = I × R). Runs fully in the browser.
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Tool guide
Ohm's Law Calculator: how it works
Practical information to understand the result and use this tool correctly.
About Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's law (V = I × R). Runs fully in the browser.
The tool runs directly in the browser for immediate results.
How to use it
- 1Enter the values you want to calculate or process.
- 2The result updates instantly on the same page.
- 3Copy, share, or export the result if the tool allows it.
Frequently asked questions
- Do I need to sign up?
- No. The tool works without an account.
- Are my data uploaded?
- Compatible operations run locally in the browser.
- What is Ohm's law?
- Ohm's law states that voltage equals current times resistance: V = I × R. It relates the three quantities in a simple resistive circuit.
- What units should I use?
- Use volts (V), amperes (A), and ohms (Ω). The calculator accepts any numeric values and returns the consistent unit.
- Does this work for AC circuits?
- This tool uses the basic DC form of Ohm's law. For AC with impedance or reactance, more advanced analysis is needed.