LED current limiting resistor calculator

Calculates a current limiting resistor for LEDs.

Example 1: Must calculate the resistor for a led string of 4 green 5mm leds and 12V supplyView example
Supply voltagevolts
Target currentamperes
Led color 
Leds in seriespcs

Fill all the values of the following
  • Supply voltage - Operating voltage of the circuit
  • Target current - Target current of a single LED
  • Led color - The emissive color of all the leds
  • Leds in series - Number of leds connected in series
  • E-series - Resistor series to select value from