EVERYDAY
Ratios & concentration
Dimensionless ratios, percentages and parts-per notation.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result1000000 ppm1 1 = 1000000 ppm
EVERYDAY · ENGINEERING · SCIENCE
1 to ppm Converter
Convert ratio (1) to parts per million (ppm). 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 ratio value to calculate parts per million 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 1 | 1 | 1 |
| percentfrom 1 | % | 100 |
| per millefrom 1 | ‰ | 1000 |
| parts per millionfrom 1 | ppm | 1000000 |
| parts per billionfrom 1 | ppb | 1000000000 |
| parts per trillionfrom 1 | ppt | 1000000000000 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
1 to ppm Conversion Reference
Ratio (1) and parts per million (ppm) are units of ratios & concentration. Use this page to convert in either direction.
Conversion Examples
| Ratio (1) | Parts Per Million (ppm) |
|---|---|
| 1 1 | 1000000 ppm |
| 5 1 | 5000000 ppm |
| 10 1 | 10000000 ppm |
| 100 1 | 100000000 ppm |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.
Reverse Conversion
ppm to 1 (parts per million to ratio)