ppm and ppb are defined as:

1ppm = 1/10^{6} = 10^{-6}

1ppb = 1/10^{9} = 10^{-9}

So

1ppm = 1000ppb

The number of parts-per million x_{ppm} is equal to the number of parts-per billion x_{ppb} divided by 1000:

*x*_{ppm} = *x*_{ppb} / 1000

Example: 7000ppb is equal to 7ppm:

*x*_{ppm} = 7000ppb / 1000 = 7ppm

ppb | ppm |
---|---|

1 | 0.001 |

10 | 0.01 |

100 | 0.1 |

1000 | 1 |

10000 | 10 |

100000 | 100 |

1000000 | 1000 |

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