Use this percent to per-mille converter to change a percent measurement into its per mille equivalent. Enter a number in the calculator above and the result updates instantly.
Parts-per-million conversions are useful for chemistry, environmental data, water quality, concentration ratios, and trace measurements.
What is a percent?
Percent (%) is a parts per million unit.
What is a per mille?
Per Mille (permille) is a parts per million unit.
Percent to Per Mille Converter formula
To convert percent to per mille, use the formula below.
1 % = 10 permille. This relationship is the conversion factor used by the calculator.
How to convert percent to per-mille
Start with the percent value, apply the formula, and round the result only after the calculation is complete.
Example: 10 % = 100 permille.
- 1 % = 10 permille
- 10 % = 100 permille
- 100 % = 1,000 permille
Manual conversion steps
- Write down the value in percent.
- Use the conversion formula: per mille = percent x 10.
- Calculate the result in per mille.
- Round the answer to the number of decimal places you need.
For quick checking, the converter above performs the same calculation automatically.
Common percent to per-mille use cases
This conversion is useful in practical situations where measurements need to move between different unit systems or audiences.
- Convert percent to per mille when you need equivalent measurements in another unit.
Common mistakes when converting percent to per-mille
These are the most common issues to watch for when doing this conversion by hand.
- Do not mix up the direction of the conversion. percent to per-mille is not the same as per-mille to percent.
- Avoid rounding too early. Keep the full result during the calculation, then round the final answer.
Percent to Per Mille conversion table
| Percent | Per Mille |
|---|---|
| 1 % | 10 permille |
| 5 % | 50 permille |
| 10 % | 100 permille |
| 25 % | 250 permille |
| 50 % | 500 permille |
| 100 % | 1,000 permille |
How to convert per-mille to percent
To reverse the conversion, switch the two units in the calculator or open the reverse conversion page: per-mille to percent.
Reversing the units is useful when you already have a value in per mille and need the equivalent value in percent.
How to use this percent to per-mille converter
- Enter the number you want to convert in the value field.
- Confirm that the from unit is Percent and the to unit is Per Mille.
- Read the converted result in the result box.
- Use the copy button if you want to paste the answer elsewhere.
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FAQ
What is the formula for percent to per-mille?
The formula is: per mille = percent x 10.
How do I convert percent to per-mille by hand?
Write down the value in percent, apply the formula, and round the final result in per mille.
How accurate is this converter?
The converter uses standard conversion factors and shows rounded results for readability.
Can I reverse the conversion?
Yes. Use the swap button in the converter or open the related reverse conversion page.
Why do results sometimes have many decimal places?
Some unit conversions do not produce short decimal values. Keep more decimal places for technical work, and round the answer for everyday use.