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Artoo
Binary, decimal and hex converter
Board release tracker: Raspberry Pi, ESP32 and Arduino
GPIO pinout: Raspberry Pi, Pico, ESP32 and Arduino Uno
LED resistor calculator
Maker tools
Ohm’s law calculator
Resistor color code calculator
LED resistor calculator
LED resistor calculator
Supply voltage (V)
LED colour
Red (about 2.0 V)
Yellow / orange (about 2.1 V)
Green (about 3.0 V)
Blue (about 3.1 V)
White (about 3.1 V)
Infrared (about 1.5 V)
Custom
Forward voltage (V)
LED current (mA)
LEDs in series
Calculate
Check your LED’s datasheet for the exact forward voltage and current.