ppm and ppt are defined as:

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

1ppt = 1/10^{12} = 10^{-12}

So

1ppm = 10^{6}ppt

The number of parts-per million x_{ppm} is equal to the number of parts-per trillion x_{ppt} divided by 10^{6}:

*x*_{pp}_{m} = *x*_{pp}_{t} / 10^{6}

Example: 7000ppt is equal to 0.007000ppm:

*x*_{ppt} = 7000ppt / 10^{6} = 0.007ppm

ppt | ppm |
---|---|

1 | 0.000001 |

10 | 0.00001 |

100 | 0.0001 |

1000 | 0.001 |

10000 | 0.01 |

100000 | 0.1 |

10^{6} |
1 |

10^{7} |
10 |

10^{8} |
100 |

10^{9} |
1000 |

10^{10} |
10000 |

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