Example: Voltage: 120 V · Resistance: 60 Ω → Current: 2 A.
Power: 240 W
Formulas: I = V÷R · P = V×I
Frequently asked questions
How do I calculate ohm’s law? Enter your numbers above and the result updates instantly. For example: Voltage: 120 V · Resistance: 60 Ω → Current: 2 A.
Is this Ohm’s Law Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for ohm’s law. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.