Method
V=IR and P=VI; from V and I, resistance is V/I and power is VI.
Everyday worksheet
Ohm's Law Calculator
Solve voltage, current, resistance and power from any two known electrical quantities.
The calculation runs locally. Results include the intermediate values, unit conversions and assumptions needed to audit the answer.
Method, assumptions and practical use
How the Ohm's Law Calculator works
V=IR and P=VI; from V and I, resistance is V/I and power is VI. Inputs stay in this browser, and the result table exposes conversions and assumptions for independent checking.
Interpret the result
Voltage drives current through resistance in the ideal linear DC model.
Check the assumptions
Real AC and nonlinear circuits may require impedance, phase and RMS analysis; work on live circuits is hazardous.
Local calculation
Everything runs in this browser. Inputs are not sent to an external calculator.
Rounding
Displayed values may be rounded for readability while calculations use full floating-point precision unless the tool explicitly uses exact integers.
Scope
Real AC and nonlinear circuits may require impedance, phase and RMS analysis; work on live circuits is hazardous.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.