Live tool/tool/led-resistor-calculator

LED Resistor Calculator

Size the series resistor for an LED string from supply voltage, forward voltage, and target current.

EngineeringElectronicsDIY

Supply voltage

LED forward voltage

LEDs in series

Target current

Series resistor

145 Ω

Power in resistor

0.058 W

Safe wattage pick

0.125 W

LED string voltage

2.1 V