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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 ppm1 ppb = 0.001 ppm
EVERYDAY · ENGINEERING · SCIENCE
ppb to ppm Converter
Convert parts per billion (ppb) 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 parts per billion 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 ppb | 1 | 0.000000001 |
| percentfrom ppb | % | 0.0000001 |
| per millefrom ppb | ‰ | 0.000001 |
| parts per millionfrom ppb | ppm | 0.001 |
| parts per billionfrom ppb | ppb | 1 |
| parts per trillionfrom ppb | ppt | 1000 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
ppb to ppm Conversion Reference
Parts Per Billion (ppb) and parts per million (ppm) are units of ratios & concentration. Use this page to convert in either direction.
Conversion Examples
| Parts Per Billion (ppb) | Parts Per Million (ppm) |
|---|---|
| 1 ppb | 0.001 ppm |
| 5 ppb | 0.005 ppm |
| 10 ppb | 0.01 ppm |
| 100 ppb | 0.1 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 ppb (parts per million to parts per billion)