R = (Vₛ − Vⁱ) / I

LED Current Resistor

Series resistor needed to limit current through an LED.

When to use

Any LED circuit to prevent overcurrent and burnout.

Fill all fields except the one you want to solve for, then tap Calculate.

Variables

RResistorΩVₛSupply VoltageVVⁱLED Fwd VoltageVILED CurrentA