What is the Ohm’s Law Calculator?
Solve Ohm’s law for voltage, current, resistance and power. These physics and science calculators apply standard SI formulas with exact constants (such as g = 9.80665 m/s² and the 2019 SI definitions) for students, engineers and curious minds.
How to use the Ohm’s Law Calculator
- Enter your solve for, your voltage, your current, your resistance.
- Results update automatically as you type; you can also press Calculate.
- Read the output: result, power.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With solve for = Voltage (V = I × R), voltage = 12 V, current = 0.5 A, resistance = 24 Ω, the Ohm’s Law Calculator returns result: 12 V; power: 6 W.
Tips for better results
- Convert inputs into SI units first for the cleanest results.
- Idealized formulas ignore friction and air resistance unless stated.
- Use our unit converters to switch between metric and imperial results.
Frequently asked questions
What does the Ohm’s Law Calculator do?
Solve Ohm’s law for voltage, current, resistance and power.
How is it calculated?
The Ohm’s Law Calculator uses this method: V = I × R · P = V × I.
Can you show an example?
With solve for = Voltage (V = I × R), voltage = 12 V, current = 0.5 A, resistance = 24 Ω, the Ohm’s Law Calculator returns result: 12 V; power: 6 W.
Is the Ohm’s Law Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Ohm’s Law Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
Related tools
📬 Get new tools first — free
Join Taurang to hear about new calculators, converters and features. No spam; unsubscribe anytime.