PPB to PPM Converter
Convert parts per billion (ppb) to parts per million (ppm). Type a number in either box and the result appears as you type.
Enter a number, for example 12.5
1 part per billion = 0.001 parts per million
Formula: ppm = ppb × 0.001
How to convert parts per billion to parts per million
1 part per billion = 0.001 parts per million
To convert parts per billion to parts per million, multiply the value by 0.001.
Example: 5 ppb × 0.001 = 0.005 ppm
PPB to PPM conversion table
| Part per billion (ppb) | Part per million (ppm) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 75 | 0.075 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
About parts per billion and parts per million
Part per billion (ppb)
One part in a billion by mass, 1 µg per kg. For water, 1 ppb equals 1 µg/L. Used for trace contaminants.
Part per million (ppm)
One part in a million by mass, 1 mg per kg. For water and dilute solutions in water, 1 ppm equals 1 mg/L. Used for chlorine, TDS and nutrients.
Frequently asked questions
What is 1 ppb in parts per million?
1 ppb = 0.001 ppm.
What is 1 ppm in parts per billion?
1 ppm = 1,000 ppb.
How do I convert parts per billion to parts per million?
To convert parts per billion to parts per million, multiply the value by 0.001. 1 part per billion = 0.001 parts per million.