PPM Converter
Convert concentration values instantly between parts per million (ppm), parts per billion (ppb), percent and milligrams per litre. Useful for water treatment, pool chemistry and lab work — this free tool updates live as you type, with no signup.
—
How to use
- Enter your concentration value in the box above.
- Choose the unit it is measured in — ppm, ppb, percent or mg/L.
- Read the equivalent values instantly; the result updates as you type.
- For water-like solutions, ppm and mg/L are nearly identical — see the note.
Tips
- In dilute water-like solutions, 1 ppm is practically the same as 1 mg/L.
- Percent is parts per hundred — 1 percent equals 10,000 ppm.
- For concentrated or thick liquids, the exact conversion depends on density.
Note
In dilute water-like solutions, 1 ppm is about 1 mg/L. In thick liquids the exact value depends on density.