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By Shailendra Singh
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Updated on 5 Mar 2025, 16:35 IST
PPM and PPT are units of measurement used to express concentration:
PPM: Stands for “parts per million.” It denotes the ratio of the number of parts of a substance to one million parts of the whole mixture. It’s commonly used for trace elements in solutions or pollutants in the environment.
PPT: Stands for “parts per trillion.” It represents an even smaller concentration, where one part of a substance is found in one trillion parts of the mixture. It’s used to express extremely minute quantities, especially in advanced scientific contexts.
Converting PPM (parts per million) to PPT (parts per trillion) involves multiplying the PPM value by 1000000. This is because there are 1000000 parts per trillion in one part per million.
Formula: PPT = PPM × 1000000
For example, if you have a concentration of 500 PPM, the equivalent value in PPT would be:
PPT = 500 PPM × 1000000 = 500,000,000 PPT
To convert PPM to PPT, simply multiply the PPM value by 1000000.
| ppm | ppt |
| 0.000001 | 1 |
| 0.00001 | 10 |
| 0.0001 | 100 |
| 0.001 | 1000 |
| 0.01 | 10000 |
| 0.1 | 100000 |
| 1 | 106 |
| 10 | 107 |
| 100 | 108 |
| 1000 | 109 |
| 10000 | 1010 |
One part per million (PPM) is equivalent to 1,000 parts per trillion (PPT).
To convert from PPM to PPT, multiply the PPM value by 1,000.
One part per trillion (PPT) signifies one part of a substance in one trillion parts of a mixture.
One part per million (PPM) represents one part of a substance in one million parts of a mixture.
The unit of 1 PPM is a concentration ratio, indicating one part of a substance in one million parts of the whole mixture.
PPM is calculated by dividing the number of parts of a substance by the total number of parts in the mixture and then multiplying by 1,000,000.
PPM typically refers to the concentration of a specific substance in a fluid or gas stream, indicating the number of parts of that substance per one million parts of the total flow.