Ohm’s Law Calculator
Solve voltage, current, or resistance from the other two values.
Enter exactly two values; leave the unknown quantity blank.
Calculations run in this browser. Values are not submitted to the server.
Result
Formula and assumptions
Uses V = I × R. Enter exactly two of voltage, current, and resistance; all values must be non-negative and resistance cannot be zero when solving current.
Example values are shown in the input placeholders. Results use browser number precision unless the tool uses exact integer arithmetic. Check units and assumptions before using a result.