LED Series Resistor Calculator

Use the calculator below to determine the series resistor needed to connect various series combinations of light emitting diodes or "LEDs". Use a resistor rated higher than the displayed power in the box below "Power (W)".

Formula: R = (Vs - Vf) / If

 

(Supply Voltage Vs   Forward Voltage Vf)   Forward Current If (mA)
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Resistor Value Ω   Power (W)    
     
         
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