PPB to Per Mille Calculator
PPB back up to ‰: divide by a million. 50,000 PPB is 0.05‰.
Calculator
PPB to Per Mille Calculator
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PPB back up to ‰: divide by a million. 50,000 PPB is 0.05‰.
How to use this calculator
- Enter PPB.
- Divide by 1,000,000.
- Read ‰.
The formula
Per mille (‰) = PPB ÷ 1,000,000
Reverse of ‰ → PPB.
What the units mean
PPB (parts per billion) — one part per billion parts. The standard unit for trace contaminants in drinking water and environmental samples.
Per mille (‰) — parts per thousand. Common in European specifications and oceanography; seawater salinity is about 35‰.
Worked example
80,000 PPB → 0.08‰.
Quick reference
| PPB | Per mille |
|---|---|
| 10,000 | 0.01‰ |
| 100,000 | 0.1‰ |
| 1,000,000 | 1‰ |
PPB ÷ 1,000,000 = ‰.
Where you will actually use this
For specs and reports that standardize on per mille.
- Report normalization
- Spec compliance
Mistakes that give wrong answers
- Dividing by 1,000 (that gives PPM-scale numbers, not ‰)
Key takeaways
- Formula: Per mille (‰) = PPB ÷ 1,000,000
- Remember: PPB ÷ 1,000,000 = ‰.
- Watch out for: Dividing by 1,000 (that gives PPM-scale numbers, not ‰)
- 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 PPB to per mille?
Divide PPB by 1,000,000.