Color Code for Resistors
Staff posted on October 20, 2006 |
Color Code for Resistors

Carbon-composition and carbon film resistors are too small to have the resistance value printed on their housings. Therefore, bands of color are used to represent the resistance value.

 1: ——— Black Brown Red Orange Yellow Green Blue Violet Gray White 2: ——— Black Brown Red Orange Yellow Green Blue Violet Gray White 3: ——— Black Brown Red Orange Yellow Green Blue Violet Gold Silver 4: None Brown Red Green Blue Violet Gold Silver Value: Enable JavaScript for calculation.

The first and second band represent the numerical value of the resistor, and the color of the third band specify the power-of-ten multiplier. The color bands are always read from left to right starting with the side that has a band closer to the edge.

For carbon-composition and carbon film resistors, the common tolerances are 5%, 10%, and 20%, indicating that the actual value of the resistor can vary from the nominal value by ±5%, ±10% and ±20%. If the band is gold, it specifies a 5% tolerance; silver specifies a 10% tolerance; if no band is present, the tolerance is 20%.

Note that the color-code system for capacitors is very similar to that of resistors except there is a fifth band representing the temperature coefficient. This band is the first one closest to one end of the capacitor. The other four fall into the same order as mentioned for resistors. In this case, the second, third, and fourth bands are used to determine the capacitance. The fifth band represents the tolerance of the capacitor.

The table below shows the color code and their associated value:

 Color First-band Digit Second-band Digit Third-band Multiplier Fourth-band Tolerance Black 0 0 100 = 1 Brown 1 1 101 = 10 1% Red 2 2 102 = 100 2% Orange 3 3 103 = 1000 3% Yellow 4 4 104 = 10000 4% Green 5 5 105 = 100000 Blue 6 6 106 = 1000000 Violet 7 7 107 = 10000000 Gray 8 8 108 = 100000000 White 9 9 109 = 1000000000 Gold 5% Silver 10% None 20%
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