Convert inHg to atm
inches of mercury to standard atmospheres. Enter a value to convert, or use the inHg to atm chart further down the page.
1 inch of mercury equals 0.0334211 standard atmospheres. Going the other way, 1 standard atmosphere = 29.9213 inches of mercury.
How to convert inHg to atm
To convert inches of mercury to standard atmospheres, multiply the inch of mercury value by 0.03342105739. You can also divide by 29.92125558 to get the same answer.
atm = inHg × 0.03342105739
Worked example
Convert 15 inHg to standard atmospheres:
15 inHg = 0.501316 atm
inHg to atm conversion chart
Use this inHg to atm table for quick reference without typing anything.
| inches of mercury (inHg) | standard atmospheres (atm) |
|---|---|
| 0.01 inHg | 0.000334211 atm |
| 0.1 inHg | 0.00334211 atm |
| 1 inHg | 0.0334211 atm |
| 2 inHg | 0.0668421 atm |
| 3 inHg | 0.100263 atm |
| 5 inHg | 0.167105 atm |
| 10 inHg | 0.334211 atm |
| 20 inHg | 0.668421 atm |
| 50 inHg | 1.67105 atm |
| 100 inHg | 3.34211 atm |
| 1,000 inHg | 33.4211 atm |
What is a inch of mercury?
An inch of mercury is about 3,386.39 pascals. Aircraft altimeters and US weather reports use it; the standard sea-level setting is 29.92 inHg.
What is a standard atmosphere?
The standard atmosphere is defined as exactly 101,325 pascals — the reference sea-level pressure.
Frequently asked questions
How many atm are in a inch of mercury?
1 inHg equals 0.0334211 atm. Going the other way, 1 atm is 29.9213 inHg.
How do you convert inHg to atm?
To convert inches of mercury to standard atmospheres, multiply the inch of mercury value by 0.03342105739. You can also divide by 29.92125558 to get the same answer.
What is 10 inHg in atm?
10 inHg equals 0.334211 atm. The conversion chart on this page lists the other values people look up most often.
Related pressure conversions
Convert inHg to other units
- atm to inHg
- inHg to psi
- inHg to bar
- inHg to pascals
- inHg to kPa
- inHg to mmHg
- inHg to torr
- inHg to millibars
Convert other units to atm
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