Ohm's Law Calculator
Solve any of voltage, current, resistance, or power using Ohm's law.
Inputs explained
- Solve For — The unknown to calculate — Voltage, Current, Resistance, or Power.
- Voltage (V) — The voltage in volts (enter when known).
- Current (A) — The current in amps (enter when known).
- Resistance (Ω) — The resistance in ohms (enter when known).
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: 12 V across 4 Ω draws 3 A and uses 36 W.
Frequently asked questions
Is the Ohm's Law Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Solve For, Voltage (V), Current (A), Resistance (Ω). Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Ohm's Law Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.