Convert atmospheres to inches of mercury
1 atm = 29.921256 inHg. Change the amount below, or read the formula and the reference table further down.
1 atmosphere equals
inches of mercury
1 atm = 29.921256 inHg
The formula
Atmospheres and inches of mercury both measure pressure from the same zero, so a single multiplier does the job.
inHg = atm × 29.92125558
Going the other way? Convert inches of mercury to atmospheres.
Atmospheres to inches of mercury table
Common values, rounded for reading.
| Atmospheres (atm) | Inches of mercury (inHg) |
|---|---|
| 1 | 29.9213 |
| 2 | 59.8425 |
| 3 | 89.7638 |
| 4 | 119.69 |
| 5 | 149.61 |
| 6 | 179.53 |
| 7 | 209.45 |
| 8 | 239.37 |
| 9 | 269.29 |
| 10 | 299.21 |
| 15 | 448.82 |
| 20 | 598.43 |
| 25 | 748.03 |
| 30 | 897.64 |
| 40 | 1,196.85 |
| 50 | 1,496.06 |
| 75 | 2,244.09 |
| 100 | 2,992.13 |
| 250 | 7,480.31 |
| 500 | 14,960.63 |
| 1,000 | 29,921.26 |
Questions people ask
- How many inches of mercury are in a atmosphere?
- One atmosphere equals 29.92125558 inches of mercury.
- How do I convert atmospheres to inches of mercury by hand?
- Multiply the number of atmospheres by 29.92125558. For a rough check, 29.9 is close enough for most everyday use.
- What is 1 atmosphere in inches of mercury?
- 1 atmosphere is 29.921256 inches of mercury.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.