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The Resistor calculator
Below you can find a LED resistor calculator:

LED resistor calculator


LED’s Threshold Voltage (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 off standard E24 value	=	Ω
Rounded off Power using standart 5% resistor	=	W
Real current through the E24 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.

Resistor01

47 kΩ, 5%

Resistor03

470 kΩ, 1%

Resistor05

Resistor07