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Parts-Per-Trillion to PPM Converter

Convert parts-per-trillion (ppt) to parts-per-million (ppm). 1,000,000 ppt = 1 ppm.

How to use it

  • Enter ppt to calculate ppm.

Examples

2,000,000 ppt2 ppm

Parts-per-trillion (ppt) is one-millionth the size of a ppm — there are 1,000,000 ppt in 1 ppm. To convert a ppt reading up to the more familiar ppm scale, divide by one million.

Where this comes up

  • Converting an ultra-trace analytical chemistry result (dioxins, PFAS) up to ppm for comparison against a broader standard
  • Environmental and pharmaceutical purity reports that mix ppt and ppm figures
  • Chemistry and lab science coursework on concentration units
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Last updated 18 August 2026