LED Series Resistor Calculator

Easily determine the perfect resistor value for your LED circuit with just a few clicks. Input your desired current and voltage, and let our tool suggest matching E series resistors to ensure optimal performance and longevity for your light-emitting diodes.

Used Formula:


Common forward voltages:
Red1.6V to 2.2V
Green1.9V to 3.2V
Blue2.9V to 3.7V
Yellow1.9V to 2.2V
White3.0V to 3.4V
Orange1.9V to 2.2V

For regular LEDs 20mA is good starting point. Consult your datasheet for exact values.