Per mille (‰) to percent converter
Per mille is used for salinity, blood alcohol limits and some fees and commissions; this converts it to a percentage directly.
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How to use it
- Enter per mille value.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
1‰ = 0.1% = 0.001. So percent = per mille ÷ 10 and decimal = per mille ÷ 1000.
Example
Inputs: Per mille value = 25 ‰. Result: Percentage: 2.5%; Decimal: 0.025; Parts per million: 25,000 ppm.
Limits and caveats
- This is a pure ratio: a value by mass or by volume stays on the same basis after converting.
Questions about this tool
What does the ‰ sign mean?
It means per thousand, so 5‰ is 5 parts out of every 1000.
What is a salinity of 35‰ as a percentage?
It is 3.5%, the typical seawater salinity quoted in textbooks.
How does ‰ differ from %?
Percent is out of 100 and per mille is out of 1000, so 1% equals 10‰.