PPM to PPT

Convert Parts Per Million (PPM) to Parts Per Trillion (PPT).

Verified ToolUpdated: January 10, 2026
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PPT

Methodology & Sources

The conversion from Parts Per Million (PPM) to Parts Per Trillion (PPT) involves a factor of exactly one million (106).

PPT=PPM×1,000,000\text{PPT} = \text{PPM} \times 1,000,000
  • PPM (Parts Per Million): 10-6 scale.
  • PPT (Parts Per Trillion): 10-12 scale.

Because a trillion is a million times smaller than a million, the numerical value increases by 1,000,000 when converting to the smaller unit.

The underlying formula used is:

PPM * 1,000,000

References

  • ISO 80000-1 Quantities and units
  • NIST Special Publication 811

Frequently Asked Questions

How do I convert PPM to PPT?

Multiply the PPM value by 1,000,000. Since parts per million (10-6) is a larger unit than parts per trillion (10-12), you scale up by a factor of one million. Formula: PPT = PPM × 1,000,000.

What is the formula for PPM to PPT?

The formula is PPT = PPM × 106. This is derived from the ratio of their scientific notations: 10-6 / 10-12 = 106.

How many PPT in 1 PPM?

There are 1,000,000 Parts Per Trillion in 1 Parts Per Million. For example, 0.001 PPM is equal to 1,000 PPT.

Is this conversion unitless?

Yes, completely. It applies universally to mass fractions (mg/kg to ng/kg), volume fractions (µL/m³ to pL/m³), and mole fractions. The density or molecular weight does not change the 106 ratio.

Why does the conversion work this way?

It is a shift in decimal magnitude. PPM represents "1 in 1,000,000" and PPT represents "1 in 1,000,000,000,000". The difference between these powers of ten is exactly six zeros (1,000,000).

How do I manually verify the result?

Shift the decimal point exactly 6 places to the right. For instance, 0.000002 PPM becomes 2 PPT. This manual check confirms the calculator's output.

What is a real-world example of this conversion?

Detecting PFAS in drinking water. A lab might report a limit of 70 PPT for PFOS/PFOA, which converts to 0.00007 PPM. This precision is vital for toxicology.

Can I use this for gases?

Yes, if inputs are consistent. For gas mixtures (PPMv), the output will be in PPTv. The conversion factor of 1,000,000 remains constant regardless of phase.

How do I calculate PPM to PPT manually?

Multiply by one million. Taking 5 PPM as an example: 5 × 1,000,000 = 5,000,000 PPT. You can also use our PPM to PPB Converter for an intermediate step (×1000).

What is the ratio of PPM to PPT?

1:1,000,000. One Part Per Million contains exactly one million Parts Per Trillion. This is similar to how PPM relates to Percent but on a much smaller scale.

Is 1 PPM equal to 1000 PPT?

No, 1 PPM is 1,000,000 PPT. 1 PPM is equal to 1,000 PPB (Parts Per Billion), but it is equal to 1,000,000 PPT (Parts Per Trillion).
Vijay Chauhan

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Ensuring every tool adheres to ASTM/IUPAC standards. Committed to providing precise, transparent, and verifiable engineering resources.

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