# 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:

$R=\frac{\mathrm{InputVoltage}-\mathrm{ForwardVoltage}}{\mathrm{LedCurrent}}$

###### Common forward voltages:

Red | 1.6V to 2.2V |

Green | 1.9V to 3.2V |

Blue | 2.9V to 3.7V |

Yellow | 1.9V to 2.2V |

White | 3.0V to 3.4V |

Orange | 1.9V to 2.2V |

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