LED Resistance Calculator

Resistor Calculator

If you don't have a calculator handy, use this JavaScript resistor calculator to do the math.

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Source Voltage	=
LED Forward Voltage Drop	=
LED Forward Current in Milliamps	=

Needed Resistance in Ohms	=
Using Closest Standard 5% Resistor
Closest Standard 5% Resistor	=
Closest Standard 5% Resistor Wattage	=
Actual Current	=
Actual Power Dissipated By LED	=
Actual Power Dissipated By Resistor	=

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Resistor Calculator