PPM, PPB and Percent Converter
Convert parts per million, parts per billion, percent, per mille and milligrams per kilogram.
Results
Result
10,000
ppm
1 % equals 10,000 ppm
What this tool does
Percent, per mille, ppm and ppb are the same idea at four different scales: a share of the whole. One percent is ten thousand ppm, and one ppm is a thousand ppb, which is easy to state and easy to get wrong at three in the morning. Milligrams per kilogram sits on the same scale — it is identical to ppm by mass — which is why soil and food reports move between the two without comment.
Worked example
1 % 10,000 ppm
Conversion table
| Unit | Result |
|---|---|
| Fraction (1 = pure) 1 | 0.01 |
| Per mille ‰ | 10 |
| Parts per million ppm | 10,000 |
| Parts per billion ppb | 10,000,000 |
| Parts per trillion ppt | 10,000,000,000 |
| Gram per kilogram g/kg | 10 |
| Milligram per kilogram mg/kg | 10,000 |
| Microgram per kilogram µg/kg | 10,000,000 |
| Milligram per gram mg/g | 10 |
Convert a whole list
One value per line. The units above are used for every line.
Limitations
- These are parts per million by mass. In water at ordinary temperatures 1 ppm is also 1 mg/L, because a litre of water weighs about a kilogram, but that equivalence fails for any other liquid and for gases.
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.