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General Information, Facts & Tables
[LED Resistance Calculator]

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Overview

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The calculator below works out the resistor value required to limit the current to a Light Emitting Diode so it wont be overloaded.  
See Also: Open Another, DC Ohms Law Calculator, Resistor Colour Code CalculatorUsing the Calculators
 

Formula

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R = (VS - VLED) / ILED
VS = (R * ILED) + VLED
VLED = VS - (R * ILED)
ILED = (VS - VLED) / R
 

Units

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R = Resistance value required (ohms [W])
VS = Voltage source (volts [V])
VLED = Voltage drop of LED (volts [V])
ILED =Current draw of LED (amperes [A])
 

Calculator

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Show all available units

R []:

   

VS []:

 

VLED []:

 

ILED []:

 

Note! Set unit values prior to calculating.
 

Notes

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The "symbol" font is required to view the ohm "W" symbol.