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LED Resistor Calculator

Most LEDs needs some form of current limiting. This can usually be done by connecting a resistor in series with the LED.
The problem is usually calculating the resistance for said resistor as doing math in your head seems to be a dying art. To help with finding the right resistor I made this simple calculator.
Source Voltage: Volts
LED Forward Voltage: Volts
LED Current: mA
EIA E-Series:
   
 
Disclaimer:The figures returned by this calculator are to be taken as a guide only. I will not be held responsible for any mishap or loss, either direct or consequential, that may occur as a result of relying on the figures herein.