š” LED Resistor Calculator
Find the correct current-limiting resistor for a single or multi-LED circuit.
Common LED Presets
Click to auto-fill typical values for common LED colours.
Circuit Values
$$R = \dfrac{V_s - n\,V_f}{I_f} \qquad P = I_f^2\,R$$
LEDs
ā Check values ā supply must exceed total LED voltage drop.
Results
Typical LED Specifications
| Colour | Vf (typical) | If (typical) | Wavelength |
|---|---|---|---|
| š“ Red | 1.8 ā 2.2 V | 10 ā 20 mA | 620 ā 750 nm |
| š Orange | 2.0 ā 2.2 V | 10 ā 20 mA | 590 ā 620 nm |
| š” Yellow | 2.0 ā 2.4 V | 10 ā 20 mA | 570 ā 590 nm |
| š¢ Green | 2.0 ā 3.5 V | 10 ā 20 mA | 495 ā 570 nm |
| šµ Blue | 2.7 ā 3.5 V | 10 ā 20 mA | 450 ā 495 nm |
| š£ Violet | 3.0 ā 4.0 V | 10 ā 20 mA | 380 ā 450 nm |
| āŖ White | 2.9 ā 3.5 V | 20 ā 30 mA | Broadband |
| Infrared | 1.2 ā 1.8 V | 20 ā 100 mA | 850 ā 950 nm |