PPM to µg/g Calculator
Need your PPM result in the µg/g format that analytical reports prefer? It is the same number — 7 PPM becomes 7 µg/g.
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PPM to µg/g Calculator
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Need your PPM result in the µg/g format that analytical reports prefer? It is the same number — 7 PPM becomes 7 µg/g.
How to use this calculator
- Enter PPM (mass basis).
- Same number = µg/g.
The formula
Definitionally identical on a mass basis.
What the units mean
PPM (parts per million) — one part of solute per million parts of the total mixture. The workhorse unit for trace concentrations in water, air, and food.
µg/g — micrograms per gram. Numerically identical to PPM on a mass basis; the unit analytical reports prefer.
Worked example
Spec: 15 PPM → report as 15 µg/g.
Quick reference
| PPM | µg/g |
|---|---|
| 1 | 1 |
| 7 | 7 |
| 15 | 15 |
| 100 | 100 |
Same number on a mass basis.
Where you will actually use this
For certificates of analysis and lab documentation that standardize on µg/g.
- Certificates of analysis
- Lab documentation
- Method validation
Mistakes that give wrong answers
- Using volume-based PPM here
Key takeaways
- Formula: µg/g = PPM (mass basis, numerically identical)
- Remember: Same number on a mass basis.
- Watch out for: Using volume-based PPM here
- Next step: run your own numbers in the calculator above, then verify with a measurement — calculated values are only as good as the inputs.
Frequently asked questions
How do you convert PPM to µg/g?
Same number on a mass basis.