### SI unit prefixes

The prefixes listed in the table are used to form decimal multiples and sub-multiples of SI Units. The prefixes may be used with any of the 29 SI units with special names with the exception of the base unit kilogram that is the only SI unit with a prefix as part of its name and symbol.

Factor | Name | Symbol |
---|---|---|

10^{1} | deca | da |

10^{2} | hecto | h |

10^{3} | kilo | k |

10^{6} | mega | M |

10^{9} | giga | G |

10^{12} | tera | T |

10^{15} | peta | P |

10^{18} | exa | E |

10^{21} | Zetta | Z |

10^{24} | Yotta | Y |

Factor | Name | Symbol |
---|---|---|

10^{ −1} | deci | d |

10^{ −2} | centi | c |

10^{ −3} | milli | m |

10^{ −6} | micro | μ |

10^{ −9} | nano | n |

10^{ −12} | pico | p |

10^{ −15} | femto | f |

10^{ −18} | atto | a |

10^{ −21} | zepto | z |

10^{ −24} | yotta | y |

Source: Table 7 of Official SI Brochure