Ohm's Law Calculator

Calculate voltage, current, resistance, or power using Ohm's Law (V = IR) with unit conversions and step-by-step working

Calculate V, I, R, or P

Calculate

Current (I)

Resistance (R)

Result Unit

Result

Calculated value with steps

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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.

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