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
Resistor02g
 Resistor02h Resistor02i
 47 kΩ, 5%
Resistor03
 
 Resistor04a Resistor04b Resistor04c Resistor04d Resistor04e Resistor04f Resistor04h Resistor04i Resistor04j Resistor04k
 470 kΩ, 1%

5-Band Code
Calculation Example
Resistor02a