LED calculator


This is the new version of the single LED series resistance calculator, good for when you have a single LED and need to know "what resistor should I use with my LED?" This calculator determines that for you.

The LED series/parallel array wizard is available for those of you who need to do calculations involving more than one LED. The wizard will help you pick the resistors make the connections for any number of LEDs.

LED calculator: current limiting resistor value

Source voltage Help
diode forward voltage Help
diode forward current (mA) Help

Sorry, the wizard can't make sense of non-numeric inputs. Please use a numeric value for source voltage.

Sorry, the wizard can't make sense of non-numeric inputs. Please use a numeric value for diode forward voltage.

Sorry, the wizard can't make sense of non-numeric inputs. Please use a numeric value for diode forward current.

Sorry, the wizard thinks numbers greater than zero make more sense for source voltage.

Sorry, the wizard thinks numbers greater than zero make more sense for diode forward voltage.

Sorry, the wizard thinks numbers greater than zero make more sense for these inputs.

LED calculator version 2.0 Copyright 2001-2006, Rob 'linear' Arnold. All rights reserved.

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