Convert parts per billions to parts per millions
1 ppb = 0.001 ppm — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.001ppm
As a fraction: 1/1000
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1 ppb = 0.001 ppm
Show this value in all 8 parts & percentages units
- Fractions 1 1e-9
- Percents % 0.000 000 1
- Per milles ‰ 0.000 001
- Per myriads ‱ 0.000 01
- Parts per millions ppm 0.001
- Parts per billions ppb 1
- Parts per trillions ppt 1000
- Parts per quadrillions ppq 1 000 000
Every row is Parts per billion (ppb) converted through the fraction, in exact rational arithmetic.
How to convert parts per billions to parts per millions
Multiply the number of parts per billions by 0.001 to get parts per millions.
The exact factor is 0.001 — as a fraction, 1/1000.
Parts per billion to Parts per million conversion table
| Parts per billions (ppb) | Parts per millions (ppm) |
|---|---|
| 1 ppb | 0.001 |
| 2 ppb | 0.002 |
| 3 ppb | 0.003 |
| 5 ppb | 0.005 |
| 10 ppb | 0.01 |
| 20 ppb | 0.02 |
| 25 ppb | 0.025 |
| 50 ppb | 0.05 |
| 100 ppb | 0.1 |
| 250 ppb | 0.25 |
| 500 ppb | 0.5 |
| 1000 ppb | 1 |
Parts per million to Parts per billion conversion table
| Parts per millions (ppm) | Parts per billions (ppb) |
|---|---|
| 1 ppm | 1000 |
| 2 ppm | 2000 |
| 3 ppm | 3000 |
| 5 ppm | 5000 |
| 10 ppm | 10 000 |
| 20 ppm | 20 000 |
| 25 ppm | 25 000 |
| 50 ppm | 50 000 |
| 100 ppm | 100 000 |
| 250 ppm | 250 000 |
| 500 ppm | 500 000 |
| 1000 ppm | 1 000 000 |
Frequently asked
How many parts per millions are in a parts per billion?
One parts per billion equals 0.001 parts per millions (ppb → ppm). That figure is exact, not rounded.
How do you convert parts per billions to parts per millions?
Multiply the number of parts per billions by 0.001 to get parts per millions.
What is 1 ppm in parts per billions?
One parts per million is 1000 parts per billions.
What is 10 ppb in ppm?
10 ppb = 0.01 ppm.