Resistor Color Codes

Color coding is used to quickly determine the capacity or rating of an electronic component. For resistors, there are generally four color bands, with the following values:

Band A is first significant figure of component value (left side)
Band B is the second significant figure
Band C is the decimal multiplier
Band D, if present, indicates tolerance value in percent (no color means 20%)

The image here shows an example:

Resistor color bands

Using the table below, this resistor would have a resistance of 2,700,000 ohms:

The first band is red, which has a value of 2, and the second band is violet, with a value of 7, so the significant figure is 27
The third band is green, which indicates a multiplier of 100,000, so the resistance value is 27 x 100,000, or 2,700,000 ohms
The fourth band is gray, so this resistor's value is 2,700,000 ohms ±0.05%

Color	Significant figures (Bands A and B)	Multiplier (Band C)	Tolerance
Black	0	1	–
Brown	1	10	±1%
Red	2	100	±2%
Orange	3	1,000	–
Yellow	4	10,000	–
Green	5	100,000	±0.5%
Blue	6	1,000,000	±0.25%
Violet	7	10,000,000	±0.1%
Gray	8	100,000,000	±0.05%
White	9	1,000,000,000	–
Gold	–	.1	±5%
Silver	–	.01	±10%
None	–	–	±20%