Convert atmospheres to millibars
1 atm = 1,013.25 mbar. Change the amount below, or read the formula and the reference table further down.
1 atmosphere equals
millibars
1 atm = 1,013.25 mbar
The formula
Atmospheres and millibars both measure pressure from the same zero, so a single multiplier does the job.
mbar = atm × 1,013.25
Going the other way? Convert millibars to atmospheres.
Atmospheres to millibars table
Common values, rounded for reading.
| Atmospheres (atm) | Millibars (mbar) |
|---|---|
| 1 | 1,013.25 |
| 2 | 2,026.5 |
| 3 | 3,039.75 |
| 4 | 4,053 |
| 5 | 5,066.25 |
| 6 | 6,079.5 |
| 7 | 7,092.75 |
| 8 | 8,106 |
| 9 | 9,119.25 |
| 10 | 10,132.5 |
| 15 | 15,198.75 |
| 20 | 20,265 |
| 25 | 25,331.25 |
| 30 | 30,397.5 |
| 40 | 40,530 |
| 50 | 50,662.5 |
| 75 | 75,993.75 |
| 100 | 101,325 |
| 250 | 253,312.5 |
| 500 | 506,625 |
| 1,000 | 1,013,250 |
Questions people ask
- How many millibars are in a atmosphere?
- One atmosphere equals 1,013.25 millibars.
- How do I convert atmospheres to millibars by hand?
- Multiply the number of atmospheres by 1,013.25. For a rough check, 1,013.25 is close enough for most everyday use.
- What is 1 atmosphere in millibars?
- 1 atmosphere is 1,013.25 millibars.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.