Ohm's Law Calculator

Calculate voltage, current, or resistance using Ohm's Law

Voltage (V)

Current (I)

Resistance (R)

Quick Guide

Ohm's Law Formulas:

Voltage (V) = Current (I) × Resistance (R)
Current (I) = Voltage (V) ÷ Resistance (R)
Resistance (R) = Voltage (V) ÷ Current (I)

Units:

Voltage: Volts (V)
Current: Amperes (A)
Resistance: Ohms (Ω)

Tips

Enter any two values to calculate the third
Use decimal points for fractional values
Results are rounded to 2 decimal places
Use the reset button to clear all fields
Check your units before calculating