PPM to µg/mL Calculator
Analytical methods love µg/mL; everyone else says PPM. In dilute water they are the same number — 25 PPM = 25 µg/mL.
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PPM to µg/mL Calculator
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Analytical methods love µg/mL; everyone else says PPM. In dilute water they are the same number — 25 PPM = 25 µg/mL.
How to use this calculator
- Enter PPM.
- Same number = µg/mL.
The formula
1 PPM ≈ 1 mg/L = 1 µg/mL in dilute water.
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/mL — micrograms per milliliter. Numerically identical to PPM in dilute water; the unit HPLC and pharma methods report in.
Worked example
Method limit 10 µg/mL → 10 PPM.
Quick reference
| PPM | µg/mL |
|---|---|
| 1 | 1 |
| 10 | 10 |
| 100 | 100 |
Dilute aqueous.
Where you will actually use this
HPLC and spec methods report µg/mL.
- HPLC methods
- Pharma assays
- Method transfers
Mistakes that give wrong answers
- Non-aqueous matrices
Key takeaways
- Formula: µg/mL = PPM (dilute aqueous, numerically identical)
- Remember: Dilute aqueous.
- Watch out for: Non-aqueous matrices
- 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/mL the same as PPM?
Yes, in dilute aqueous solutions.