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:

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% |