Ohm's Law Calculator
Calculate Voltage (V), Current (I), Resistance (R), and Power (P) using Ohm's Law. Enter any two known values and the calculator derives the remaining values using V=IR, P=VI, P=IĀ²R, and P=VĀ²/R.
How to Use Ohm's Law Calculator
Enter at least two known electrical values (Voltage, Current, Resistance, or Power) and click Calculate. The tool uses Ohm's Law relationships to derive all unknown values.
Step-by-Step Instructions
- Enter at least two known values (V, I, R, or P)
- Click Calculate to derive unknown values
- View all four electrical quantities
- Copy results using the copy button
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