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

*x*_{ppt} = *x*_{ppm} ⋅ 10^{6}

Example: 7ppm is equal to 7000ppb:

*x*_{ppt} = 7ppm ⋅ 10^{6} = 7000000ppt

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

0.000001 | 1 |

0.00001 | 10 |

0.0001 | 100 |

0.001 | 1000 |

0.01 | 10000 |

0.1 | 100000 |

1 | 10^{6} |

10 | 10^{7} |

100 | 10^{8} |

1000 | 10^{9} |

10000 | 10^{10} |

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