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

*x*_{ppb} = *x*_{ppm} ⋅ 1000

Example: 7ppm is equal to 7000ppb:

*x*_{ppb} = 7ppm ⋅ 1000 = 7000ppb

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

0.001 | 1 |

0.01 | 10 |

0.1 | 100 |

1 | 1000 |

10 | 10000 |

100 | 100000 |

1000 | 1000000 |

10000 | 10000000 |

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