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LED Resistor Value Calculator

Mark Donnison
LED Resistor Value Calculator featured image

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 resistor 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.

LED type:
LED brightness (at typical current):
mCd
LED forward voltage:
V
Max LED current:
mA
Typical LED current:
mA
Battery voltage:
V
Number of parallel LEDs:
Calculated resistance:
Ohms
Preferred value:
Ohms
Resistor colour bands:

 

Instructions

  1. Select an LED from the “LED type” drop down menu.
  2. Click the “Get LED details” button.
  3. If required, adjust the Typical LED current.
  4. If using more than 1 LED in parallel, change the number of LEDs.
  5. Enter the battery voltage.
  6. Click the “Calculate resistor” button.
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