g/L to PPM Converter
Common Conversions
| g/L | ppm |
|---|---|
| 0.001 | 1 |
| 0.01 | 10 |
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
Why this conversion matters in chemistry
Seawater TDS lands around 35 g/L, which is 35,000 ppm. Same number, different label. Drinking water has to stay under the EPA secondary MCL of 500 mg/L (0.5 g/L). The factor of 1000 holds because in dilute aqueous solution, 1 g of solute in 1 L is also 1 g of solute in roughly 1 kg of solvent — the mass and volume scales line up. Take that assumption away and the conversion needs an explicit density correction.
Formula
Worked Examples
The conversion anchor — 1 g/L equals 1 mg/mL equals 1000 ppm in dilute aqueous solution.
100 mg/L expressed as ppm — a common upper limit for many regulated trace contaminants.
One milligram per liter, the floor at which trace concentrations start being reportable in mg/L instead of µg/L.
About the TDS of brackish water — also exactly 1% w/v, the same concentration in three different notations.