Parts per million to parts per billion
Type a value in ppm to get it in ppb instantly.
50,000ppb
That's 2× as strong as a workplace exposure limit, while a detector alarm level is 4× higher. That is about one molecule of it in every 20,000 of air.
What it means
What is in the air?
Weight-per-volume figures assume 25 °C and one atmosphere. A hot or high-altitude measurement needs its own molar volume.
The math
How to convert ppm to ppb
To convert parts per million to parts per billion, multiply by 1,000.
Example: 50 ppm × 1,000 = 50,000 ppb.
In the other direction, 1 ppb = 0.001 ppm.
The table below is for Carbon monoxide, CO (28.01 g/mol), using its molar mass.
Every unit
Your concentration in every unit
Tables
ppm to ppb conversion table
| ppm | ppb |
|---|---|
| 0.1 ppm | 100 ppb |
| 0.5 ppm | 500 ppb |
| 1 ppm | 1,000 ppb |
| 5 ppm | 5,000 ppb |
| 10 ppm | 10,000 ppb |
| 25 ppm | 25,000 ppb |
| 50 ppm | 50,000 ppb |
| 100 ppm | 100,000 ppb |
| 200 ppm | 200,000 ppb |
| 500 ppm | 500,000 ppb |
| 1,000 ppm | 1,000,000 ppb |
ppb to ppm conversion table
| ppb | ppm |
|---|---|
| 0.1 ppb | 0.0001 ppm |
| 0.5 ppb | 0.0005 ppm |
| 1 ppb | 0.001 ppm |
| 5 ppb | 0.005 ppm |
| 10 ppb | 0.01 ppm |
| 25 ppb | 0.025 ppm |
| 50 ppb | 0.05 ppm |
| 100 ppb | 0.1 ppm |
| 200 ppb | 0.2 ppm |
| 500 ppb | 0.5 ppm |
| 1,000 ppb | 1 ppm |
Quick answers
Quick answers
- How many ppb is 1 ppm?
- 1 ppm is 1,000 ppb.
- How many ppb is 10 ppm?
- 10 ppm is 10,000 ppb.
- How many ppb is 50 ppm?
- 50 ppm is 50,000 ppb.
The units
About these units
Parts per million (ppm)
Parts by volume, the unit every gas detector reads in.
Parts per billion (ppb)
For trace pollutants such as ozone and nitrogen dioxide.
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