Calculate the current-limiting resistor for single LEDs, series strings or parallel arrays. · in Resistors
current limitlighting
Calculate the current-limiting resistor for single LEDs, series strings or parallel arrays. Choose from LED-colour presets (red, green, blue, white…) or enter your own Vf / If. Shows the theoretical value, the E24 part to actually buy, and the resistor's power rating.
LED Resistor Calculator — Preset LED colour, series and parallel branchesLED Resistor Calculator — Custom forward voltage and current
How to use
What it's for
Size the current-limiting resistor for LEDs — single, series or parallel arrays.
You enter
Supply voltage.
LED forward voltage (Vf) and forward current (If) — presets by LED colour, or your own figures.
Array layout (single / series / parallel) and LED count.
You get
Theoretical resistor value and the E24 value to actually use.
Resistor dissipation (so you can pick the wattage) and total supply current.
