Series LED Resistor Calculator

Sample Test Image

Formula:

\[ R = \frac{V_{supply} - V_{LED}}{I_{LED}} \]

\[ P = (V_{supply} - V_{LED}) \times I_{LED} \]

Typical LED Forward Voltage (Vf)
LED Color Typical Vf (V)
Red 1.8 - 2.1
Amber 2.0 - 2.2
Orange 1.9 - 2.2
Yellow 1.9 - 2.2
Green 2.0 - 3.1
Blue 3.0 - 3.7
White 3.0 - 3.4