Resistor calculator

LED resistor calculator
Choose your LED color:
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

47 kΩ, 5%

470 kΩ, 1%

5-Band Code

Calculation Example