Ohm's Law Calculator

Calculate Voltage (V), Current (I), Resistance (R), and Power (P). Enter any two values to find the others.

Enter 2 Values

Calculated Values

Voltage

-- V

Current

-- A

Resistance

-- Ω

Power

-- W

Formulas Used:

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Ohm's Law Wheel

P (Watts) I (Amps) R (Ohms) V (Volts) V x I V / R V / I I x R Ohm's Law

This wheel shows the relationship between Power (P), Intensity/Current (I), Resistance (R), and Voltage (E or V). Select the variable you want to find to see the formulas.