LED Series Resistor Calculator and Formula
Farnell's LED series resistor calculator and formula allow you to calculate the proper resistance for your LED devices based on your existing specifications.
LED Series Resistor Calculator
LED Series Resistor Formula
R = ((Vs - Vf) / If)
LED Series Resistor Diagram
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LED Series Resistor Conversion Chart
| LED Color | Typical Vf Range |
|---|---|
| Red | 1.8 to 2.1 |
| Amber | 2 to 2.2 |
| Orange | 1.9 to 2.2 |
| Yellow | 1.9 to 2.2 |
| Green | 2 to 3.1 |
| Blue | 3 to 3.7 |
| White | 3 to 3.4 |
