µg/g to PPM Calculator
Micrograms per gram looks technical, but it is just PPM wearing a lab coat. 3.5 µg/g = 3.5 PPM (mass basis). Analytical reports use µg/g; everyone else uses PPM.
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µg/g to PPM Calculator
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Micrograms per gram looks technical, but it is just PPM wearing a lab coat. 3.5 µg/g = 3.5 PPM (mass basis). Analytical reports use µg/g; everyone else uses PPM.
How to use this calculator
- Enter the µg/g value.
- Same number = PPM.
- Verify mass basis.
The formula
1 µg/g = 1 part per 10⁶ parts by mass = 1 PPM.
What the units mean
µg/g — micrograms per gram. Numerically identical to PPM on a mass basis; the unit analytical reports prefer.
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.
Worked example
An assay reports 12 µg/g of an impurity → 12 PPM against the 10 PPM limit — over the limit.
Quick reference
| µg/g | PPM |
|---|---|
| 0.5 | 0.5 |
| 2 | 2 |
| 10 | 10 |
| 50 | 50 |
Identical on a mass basis.
Where you will actually use this
Bridges analytical-chemistry reporting with the PPM language of specs and regulations.
- Pharma impurity assays
- Food testing
- Materials analysis
Mistakes that give wrong answers
- Mixing µg/g with µg/mL (volume!)
- Assuming basis without checking
Key takeaways
- Formula: PPM = µg/g (mass basis, numerically identical)
- Remember: Identical on a mass basis.
- Watch out for: Mixing µg/g with µg/mL (volume!)
- 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
Is µg/g the same as PPM?
Yes on a mass basis.
What is 2 µg/g in PPM?
2 PPM.