1 atmosphere 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
Values either side of 1 atm.
| Atmospheres (atm) | Millibars (mbar) |
|---|---|
| -4 | -4,053 |
| -3.5 | -3,546.38 |
| -3 | -3,039.75 |
| -2.5 | -2,533.13 |
| -2 | -2,026.5 |
| -1.5 | -1,519.88 |
| -1 | -1,013.25 |
| -0.5 | -506.63 |
| 0 | 0 |
| 0.5 | 506.63 |
| 1 | 1,013.25 |
| 1.5 | 1,519.88 |
| 2 | 2,026.5 |
| 2.5 | 2,533.13 |
| 3 | 3,039.75 |
| 3.5 | 3,546.38 |
| 4 | 4,053 |
| 4.5 | 4,559.63 |
| 5 | 5,066.25 |
| 5.5 | 5,572.88 |
| 6 | 6,079.5 |
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.