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PPM to Parts-Per-Trillion Converter

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

How to use it

  • Enter ppm to calculate ppt.

Examples

1 ppm1,000,000 ppt

Parts-per-trillion (ppt) is the smallest of the common concentration units — a trillion is a million times a million, so 1 ppm = 1,000,000 ppt. Multiply by one million to convert.

Where this comes up

  • Ultra-trace analytical chemistry — dioxins, PFAS and other pollutants are often regulated at ppt levels
  • High-purity semiconductor and pharmaceutical manufacturing specs
  • Environmental research needing resolution far below what ppm can express
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Last updated 18 August 2026