Ohm's Law Calculator
Solve voltage, current, resistance, and power from known electrical values.
Inputs
Result
Example Inputs: V = 12, R = 6
Example Output: I = 2 A, P = 24 W
Live Result: Enter values and click Calculate.
Formula
V = I * R; I = V / R; R = V / I; P = V * I = I^2 * R = V^2 / R
Worked Example
Use the example inputs and outputs above to walk through the calculation step-by-step.
FAQ
What values do I need to enter?
Enter any two of voltage, current, and resistance. The calculator solves the third value and power.
Why do I get an inconsistency error?
If you enter all three values, they must satisfy V = I * R within rounding tolerance.
Can I use engineering notation?
Yes. Inputs like 4.7k or 20mA are accepted.
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View ProductFormula Notes
This calculator solves standard DC relationships for V, I, R, and power.
Worked Example
With V=12 and R=6, current is 2 amps and power is 24 watts.