# Resistor to diode LED

Every LED has a specified maximum current, exceeding this value will damage it. To protect or limit current, we simply use a resistor in series with it. This LED resistor calculator will help you choose the right resistor value for your LED.

**Vs**is the source voltage, measured in volts (V)**Vled**is the voltage drop across the LED, measured in volts (V)**Iled**is the current through the LED, measured in Amperes (Amps/A)**R**is the resistance, measured in Ohms (Ω).

**You need a resistor:**

Resistance: | |

Power: |