PPM Concentration Converter
Universal converter for concentration units: parts-per-million (ppm), parts-per-billion (ppb), ppt, permille, and percent.
How to use it
- Select any concentration units to convert.
Examples
| 100 ppm | 0.01% |
Percent, permille, ppm, ppb and ppt are all the same idea — a proportion of a whole — expressed at different scales. Each step down multiplies the number by 1,000 or 10,000 depending on the pair, which is why the same real-world concentration looks tiny in ppm and enormous in ppt.
How the scales relate
| Unit | Parts per | Equal to |
|---|---|---|
| Percent (%) | 100 | 10,000 ppm |
| Permille (‰) | 1,000 | 1,000 ppm |
| PPM | 1,000,000 | 1,000 ppb |
| PPB | 1,000,000,000 | 1,000 ppt |
| PPT | 1,000,000,000,000 | — |
Where this comes up
- Water and air quality reports that mix percent, ppm and ppb across different pollutants
- Chemistry, environmental science and manufacturing tolerance specs needing quick unit switching
- Cross-checking a lab result against a regulatory limit expressed in a different concentration unit
Runs entirely in your browser. Nothing you type is uploaded, logged or shared.
Last updated 18 August 2026