Concentration Converter
Convert dimensionless concentration ratios among %, ‰, ppm, and ppb using percent as the reference.
How to use
- Enter a dimensionless concentration ratio on the same basis and choose its source/target notation from %, ‰, ppm, and ppb.
Capabilities and scope
Re-express the same fraction as parts per hundred, thousand, million, or billion.
How it works
Percent is the reference: ‰=0.1%, ppm=0.0001%, and ppb=0.0000001%.
Example
1% equals 10,000 ppm or 10,000,000 ppb.
Useful for
- Convert percentage concentration to ppm
- Compare trace ppb and ppm values
- Normalize ratio notation in data
Before you use it
- The tool does not infer whether a concentration is mass/mass, volume/volume, or mole fraction. Converting between those definitions needs density, molar mass, or other context.
Standards and references
Frequently asked questions
Is 1 ppm always 1 mg/L?
No. ppm is a dimensionless ratio while mg/L is mass per volume; they can only coincide under specific assumptions.