# LED current limiting resistor calculator

## Calculates a current limiting resistor for LEDs.

Example 1: Must calculate the resistor for a led string of 4 green 5mm leds and 12V supply | View example |

Results | |

Total voltage drop in leds | 10.4 volts |

Required resistor | 80 ohms |

Nearest resistor in E-series | 82 ohms |

Resistor power loss | ~31.219512 milliwatts |

Current with selected resistor | ~19.512195 milliamperes |