led light emitting diode current limiting resistor value calculation

single led circuit
note: different manufacturers and different colors have different pressure drops.

red: 2.0-2.2v yellow: 1.8-2.0v

white: 3.0-4v blue: 3.0-4v

green: 2.0-2.2v 3.0-3.2v the above is for reference only
supply voltage
  V
led voltage drop
  V
required led current
  mA



calculate current limiting resistor
  Ω
nearest standard resistor
 
calculate resistor power
  W
safe resistor power
  W
Single led with single resistor
led series circuit
supply voltage
V
led voltage drop
  V
required led current
  mA
number of connected leds
 



calculate current limiting resistor
  Ω
nearest standard resistor
 
calculate resistor power
  W
safe resistor power
  W
led parallel circuit
supply voltage
  V
led voltage drop
  V
required led current
  mA
number of connected leds
 



calculate current limiting resistor
  Ω
nearest standard resistor
 
calculate resistor power
  W
safe resistor power
  W

led light emitting diode current limiting resistor value calculation