Enter the voltage source, voltage drop across the LED, and the current through the LED into the calculator. The calculator will display the need resistance for the simple circuit.

## LED Resistor Formula

The following formula is used to calculate the resistance of an LED circuit.

R = (Vs – Vl)/ IL

- Where R is the resistance
- V is the voltage of the source
- Vl is the voltage drop across the LED
- IL is the current through the LED

How to calculate LED resistor

**First, determine the source voltage**Measure or calculate the voltage coming from the source.

**Next, measure the voltage drop across the LED**This can be done by measure directly after the LED and subtracting that value from the source voltage.

**Next, measure the current across the LED**Measure or calculate the current across the LED.

**Finally, calculate the resistance**Using the information from steps 1,2 and 3, calculate the LED resistance.

## FAQ

**What is a LED resistor?**

The LED resistor is the total resistance needed for a simple LED circuit in order for it to work properly.

## Related Terms

led resistor calculator |

led resistor formula |

how to calculate led resistor |

led voltage calculator |

led current calculator |

led series resistor calculator |

current limiting resistor calculator |

led resistor calc |

led parallel calculator |

led series calculator |

ir led resistor calculator |

led voltage drop calculator |

resistor value for led |

parallel led resistor calculator |

led resistor calculator for ac |

led current limiting resistor calculator |

resistor calculator 12v to 3v |

how to calculate resistor value for led |

load resistor calculator |

smd led resistor calculator |

red led resistor calculator |

led diode resistor calculator |

rgb led resistor calculator |

led resistor calculator online |

5v led resistor calculator |

led ohm calculator |

led series parallel calculator |

led resistor value calculator |

led strip resistor calculator |

led resistor chart |

led forward voltage calculator |

green led resistor calculator |

12v led resistor calculator |

led light resistor calculator |

multiple led resistor calculator |

3mm led resistor calculator |

led and resistor calculator |

led voltage resistor calculator |

how to determine resistor for led |

led dropping resistor calculator |

calculate resistor needed |

blue led resistor calculator |

resistor needed calculator |

how to calculate current limiting resistor |

led limiting resistor calculator |

led circuit resistor calculator |

led current resistor calculator |

5mm led resistor calculator |

led forward current calculator |

white led resistor calculator |

forward voltage calculator |

calculate current through led |

how to calculate resistance value for led |

led load resistor calculator |

led array resistor calculator |

smd led voltage calculator |

led series and parallel calculator |

how to calculate resistor needed |

how to calculate the resistor needed for an led |

determine resistor for led |

led series resistance calculator |