Convert inches of mercury to atmospheres
1 inHg = 0.03342106 atm. Change the amount below, or read the formula and the reference table further down.
1 inch of mercury equals
atmospheres
1 inHg = 0.03342106 atm
The formula
Inches of mercury and atmospheres both measure pressure from the same zero, so a single multiplier does the job.
atm = inHg × 0.0334210574
Going the other way? Convert atmospheres to inches of mercury.
Inches of mercury to atmospheres table
Common values, rounded for reading.
| Inches of mercury (inHg) | Atmospheres (atm) |
|---|---|
| 1 | 0.033421 |
| 2 | 0.066842 |
| 3 | 0.100263 |
| 4 | 0.133684 |
| 5 | 0.167105 |
| 6 | 0.200526 |
| 7 | 0.233947 |
| 8 | 0.267368 |
| 9 | 0.30079 |
| 10 | 0.334211 |
| 15 | 0.501316 |
| 20 | 0.668421 |
| 25 | 0.835526 |
| 30 | 1.0026 |
| 40 | 1.3368 |
| 50 | 1.6711 |
| 75 | 2.5066 |
| 100 | 3.3421 |
| 250 | 8.3553 |
| 500 | 16.7105 |
| 1,000 | 33.4211 |
Questions people ask
- How many atmospheres are in a inch of mercury?
- One inch of mercury equals 0.0334210574 atmospheres.
- How do I convert inches of mercury to atmospheres by hand?
- Multiply the number of inches of mercury by 0.0334210574. For a rough check, 0.033 is close enough for most everyday use.
- What is 1 inch of mercury in atmospheres?
- 1 inch of mercury is 0.03342106 atmospheres.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.