LED Series Resistor Calculator

The LED series resistor calculator is an essential tool for determining the appropriate resistor value to use in series with an LED to limit the current and protect the diode from damage due to excessive current flow. LEDs (Light Emitting Diodes) require a specific current to operate efficiently, and using the wrong resistor value can lead to a shortened LED lifespan or even immediate failure.
V
V
mA
Resistor Value
Ω
Power
W
FORMULA