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Ratios & concentration
Dimensionless ratios, percentages and parts-per notation.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result0.001 ‰1 ppm = 0.001 ‰
EVERYDAY · ENGINEERING · SCIENCE
ppm to ‰ Converter
Convert parts per million (ppm) to per mille (‰). Enter a value for an instant result, or use the examples and reverse conversion below.
520units ready to convert
HOW IT IS CALCULATED
Convert through ratio
Enter a parts per million value to calculate per mille with full internal precision before display rounding.
Display PrecisionAuto · 6 significant digits
Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| ratiofrom ppm | 1 | 0.000001 |
| percentfrom ppm | % | 0.0001 |
| per millefrom ppm | ‰ | 0.001 |
| parts per millionfrom ppm | ppm | 1 |
| parts per billionfrom ppm | ppb | 1000 |
| parts per trillionfrom ppm | ppt | 1000000 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
ppm to ‰ Conversion Reference
Parts Per Million (ppm) and per mille (‰) are units of ratios & concentration. Use this page to convert in either direction.
Conversion Examples
| Parts Per Million (ppm) | Per Mille (‰) |
|---|---|
| 1 ppm | 0.001 ‰ |
| 5 ppm | 0.005 ‰ |
| 10 ppm | 0.01 ‰ |
| 100 ppm | 0.1 ‰ |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.
Reverse Conversion
‰ to ppm (per mille to parts per million)