Parts per million to milligrams per cubic meter
Type a value in ppm to get it in mg/m³ instantly.
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.
Convert the other way: mg/m³ to ppm
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 mg/m³
Volume becomes weight through the molar mass: mg/m³ = ppm × molar mass ÷ 24.45 at 25 °C. The figures below use the gas selected above.
Example: 50 ppm = 57.2802 mg/m³.
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 mg/m³ conversion table
| ppm | mg/m³ |
|---|---|
| 0.1 ppm | 0.11456 mg/m³ |
| 0.5 ppm | 0.572802 mg/m³ |
| 1 ppm | 1.1456 mg/m³ |
| 5 ppm | 5.72802 mg/m³ |
| 10 ppm | 11.456 mg/m³ |
| 25 ppm | 28.6401 mg/m³ |
| 50 ppm | 57.2802 mg/m³ |
| 100 ppm | 114.56 mg/m³ |
| 200 ppm | 229.121 mg/m³ |
| 500 ppm | 572.802 mg/m³ |
| 1,000 ppm | 1,145.6 mg/m³ |
mg/m³ to ppm conversion table
| mg/m³ | ppm |
|---|---|
| 0.1 mg/m³ | 0.0872903 ppm |
| 0.5 mg/m³ | 0.436451 ppm |
| 1 mg/m³ | 0.872903 ppm |
| 5 mg/m³ | 4.36451 ppm |
| 10 mg/m³ | 8.72903 ppm |
| 25 mg/m³ | 21.8226 ppm |
| 50 mg/m³ | 43.6451 ppm |
| 100 mg/m³ | 87.2903 ppm |
| 200 mg/m³ | 174.581 ppm |
| 500 mg/m³ | 436.451 ppm |
| 1,000 mg/m³ | 872.903 ppm |
Quick answers
Quick answers
- How many mg/m³ is 1 ppm?
- 1 ppm is 1.1456 mg/m³.
- How many mg/m³ is 10 ppm?
- 10 ppm is 11.456 mg/m³.
- How many mg/m³ is 50 ppm?
- 50 ppm is 57.2802 mg/m³.
The units
About these units
Parts per million (ppm)
Parts by volume, the unit every gas detector reads in.
Milligrams per cubic meter (mg/m³)
How workplace exposure limits are written, by weight.
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