LED Resistor Calculator
Typical LED current is between 10mA - 20mA! Low power LED is 5mA - 10mA!
Consult your LED's datasheet before testing! If no datasheet is available, use ~20mA for initial testing.
Note: You should avoid connecting LEDs in parallel with just one resistor shared between them. Identical LEDs can be successfully connected in parallel, but each LED may have a slightly different voltage drop, and the brightness of the LEDs will differ. If you want to connect the LEDs in parallel each one should have its own resistor.
| Color | Voltage Drop |
|---|---|
| Red | 2V |
| Green | 3.2V |
| Blue | 3.2V |
| White | 3.2V |
| Yellow | 2V |
| Orange | 2V |
| Amber | 2V |
Cathode = Negative (Flat edge of LED)
Anode = Positive
Example Circuits
