Resistor calculator


LED resistor calculator

Choose your LED color:

Infra Red Deep Red Red Orange Yellow Yellow green Green Bluish green Blue White Warmwhite Pink Ultra Violet

LED’s Threshold Voltage (or click on LED color above)  V
Number of LED’s in serial  Eaches
Supply Voltage  V
LED current (watch the specification)  mA

Calculate the Resistor:    

Calculated resistance in Ohms  Ω
Rounded standard E12 value  Ω
Rounded Power using standart 5% resistor  W
Real current through the E12 resistor  mA
Dissipated Power in the LED  mW
Dissipated Power in the resistor  mW

In the chart below you can click on the color fields to update the resistor colors and values.

4-Band Code

Resistor02a Resistor02b Resistor02c Resistor02d Resistor02e Resistor02f
Resistor02h Resistor02i
 47 kΩ, 5%
Resistor04a Resistor04b Resistor04c Resistor04d Resistor04e Resistor04f Resistor04h Resistor04i Resistor04j Resistor04k
 470 kΩ, 1%

5-Band Code

Calculation Example