Pick Resistors for Arduino & LEDs
Identify the resistor you need for LED current limiting and pull-ups.
Digit 1
Digit 2
Multiplier
Tolerance
💡 Read bands from the end with the tolerance band (often gold or silver) on the right. 4-band resistors use two significant digits; 5- and 6-band use three for tighter precision.
Arduino tips
A typical LED current-limiting resistor is 220Ω-330Ω (red-red-brown or orange-orange-brown).
Pull-up/pull-down resistors for buttons are usually 10kΩ (brown-black-orange).
Found a loose resistor in your kit? Match its bands here to know exactly what it is before soldering.
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Also check out…
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Decode the most common resistor type: two digits,
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Decode 6-Band Resistors
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Learn the Resistor Color Code
Practice reading bands and check your answers whil