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Calculate Resistor Value for LED

This calculator is used to find the value of the dropping resistor required to limit the current of an LED to the selected milliamps. The Vf defaults to 1.8v and is typical for most LEDs, except blue and white which will be slightly higher. Merely change the current value that you wish for the LED and hit the Calculate button. The R1 value is reported in ohms.

Voltage Supply

LED forward voltage

LED current


in milliamps

Resistor value (R1)

Need to Convert Voltage Gain to Decibels?

©2003 Jack Orman
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This page last modified on Monday, 01-Oct-2007 16:59:12 PDT

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