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Calculate voltage, current, or resistance using Ohm's Law.
About this tool
Calculate voltage, current, or resistance using Ohm's Law.
The Ohms Law Calculator helps you solve for voltage, current, or resistance using Ohm's Law (V=IR). Simply enter two known values and the calculator will compute the third.
Open Ohms Law Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Save time on manual calculations.
Get instant results for better decision-making.
Help understand electrical concepts.
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them (V=IR).
Enter any two known values (voltage, current, or resistance), and the calculator will solve for the third.
Ensure all values are in volts (V), amperes (A), and ohms (Ω) respectively.