Convert millibars to atmospheres
1 mbar = 0.00098692 atm. Change the amount below, or read the formula and the reference table further down.
1 millibar equals
atmospheres
1 mbar = 0.00098692 atm
The formula
Millibars and atmospheres both measure pressure from the same zero, so a single multiplier does the job.
atm = mbar × 0.0009869233
Going the other way? Convert atmospheres to millibars.
Millibars to atmospheres table
Common values, rounded for reading.
| Millibars (mbar) | Atmospheres (atm) |
|---|---|
| 1 | 0.000987 |
| 2 | 0.001974 |
| 3 | 0.002961 |
| 4 | 0.003948 |
| 5 | 0.004935 |
| 6 | 0.005922 |
| 7 | 0.006908 |
| 8 | 0.007895 |
| 9 | 0.008882 |
| 10 | 0.009869 |
| 15 | 0.014804 |
| 20 | 0.019738 |
| 25 | 0.024673 |
| 30 | 0.029608 |
| 40 | 0.039477 |
| 50 | 0.049346 |
| 75 | 0.074019 |
| 100 | 0.098692 |
| 250 | 0.246731 |
| 500 | 0.493462 |
| 1,000 | 0.986923 |
Questions people ask
- How many atmospheres are in a millibar?
- One millibar equals 0.0009869233 atmospheres.
- How do I convert millibars to atmospheres by hand?
- Multiply the number of millibars by 0.0009869233. For a rough check, 0.001 is close enough for most everyday use.
- What is 1 millibar in atmospheres?
- 1 millibar is 0.00098692 atmospheres.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.