Ohm's Law Calculator
Calculate V, I, R, or P
Calculate
Result Unit
Result
Calculated value with steps
No Result Yet
Enter values and click Calculate to see the result.
How to Use
- Select what to calculate :- Choose Voltage, Current, Resistance, or Power
- Enter known values :- Input the values you already know. For Power, enter any two of V, I, R
- Select units :- Choose units for input values and the result
- Click Calculate :- View the result with step-by-step working
Note: Ohm's Law: V = I × R. Power formulas: P = V × I = I² × R = V² / R. Units are converted automatically.