ng/g to PPB Converter
Common Conversions
| ng/g | ppb |
|---|---|
| 0.1 | 0.1 |
| 1 | 1 |
| 5 | 5 |
| 10 | 10 |
| 50 | 50 |
| 100 | 100 |
| 500 | 500 |
| 1000 | 1000 |
| 5000 | 5000 |
| 10000 | 10000 |
| 100000 | 100000 |
| 1000000 | 1000000 |
Why this conversion matters in chemistry
For solid and tissue samples, ng/g and ppb describe the same mass ratio. Both are nanograms of analyte per 10⁹ ng of sample. A 25 ng/g PCB result on a fish-tissue composite is 25 ppb on a regulatory consumption advisory — same number, two unit conventions. The identity rests on the mass per mass framing; for liquid samples reported in ng/mL, the equivalence depends on density. Trace residue analysis runs almost entirely at this scale, which is why the two notations stay interchangeable in environmental and food-chemistry work.
Formula
Worked Examples
The identity itself — one nanogram per gram is one part per 10⁹ by mass.
A trace contaminant at the low end of routine analytical detection in a solid matrix.
An elevated contaminant level — well above background for many regulated trace analytes in food or sediment.
Equivalently 1 ppm or 1 mg/kg — the boundary where the next prefix up becomes more readable.