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LED Resistor Value Calculator

When we use LEDs in circuits we always use a series resistor. We've made it even easier for you to calculate the value of this resitor with our LED calculator below. You can also watch this video where Kevin explains why we always use a series resistor, and explains how to calculate the value of the resistor.

 

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6 thoughts on “LED Resistor Value Calculator”

  • Ray Taylor November 24, 2016 at 11:46 am

    H, ref. resistor calculator, is it giving me the resistor per led or single resistor for how many leds in the circuit

    Reply
    • Rob Haywood December 8, 2016 at 2:19 pm

      Hi Ray,

      A single resistor for the amount of LEDs you entered in the calculator.

      Rob

      Reply
  • SURINDER MEHTA December 19, 2018 at 4:54 pm

    Hi want to make parallel red led (20 LEDs) design which running on 12v bike battery. Pls suggest me exact resistor value and help to make correct circuit.
    Thank you

    Reply
    • Mark Donnison December 20, 2018 at 8:46 am

      Without knowing the specifications of the LEDs it is impossible to say.

      Reply
      • SURINDER MEHTA December 28, 2018 at 3:29 am

        20 ea Diode Red LEDs approx 2v each, I want to make parallel design which running on 12v battery for my bike indicators. Pls suggest Resistance value..

        Reply
  • SURINDER MEHTA December 29, 2018 at 3:41 am

    Use 20 ea Diode Red LEDs approx 2v each, I want to make parallel design which running on 12v battery for my bike indicators. Pls suggest Resistance value..
    Pls help

    Reply
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