Table Of Contents
Atmospheres to inch of mercury Conversion
1 atmospheres (atm) is equal to 29.92125558 inch of mercury (inHg).
1 atm = 29.92125558 inHg
or
1 inHg = 0.03342105739 atm
Formula
To convert a pressure from atmospheres (atm) to inch of mercury (inHg), multiply the pressure in atmospheres by 29.92125558
p(inHg) = p(atm) × 29.92125558
Examples:
Convert 1 atmospheres to inch of mercury:
p(inHg) = 1atm × 29.92125558 = 29.92125558 inHg
Conversion table
| Atmospheres (atm) | Inch of mercury (inHg) |
|---|---|
| 1 atm | 29.92125558 inHg |
| 2 atm | 59.842511159 inHg |
| 3 atm | 89.763766739 inHg |
| 5 atm | 149.606277899 inHg |
| 10 atm | 299.212555797 inHg |
| 20 atm | 598.425111595 inHg |
| 25 atm | 748.031389494 inHg |
| 50 atm | 1496.062778987 inHg |
| 100 atm | 2992.125557975 inHg |
| 250 atm | 7480.313894937 inHg |
| 500 atm | 14960.627789874 inHg |
| 1000 atm | 29921.255579748 inHg |
| Inch of mercury (inHg) | Atmospheres (atm) |
|---|---|
| 1 inHg | 0.033421057 atm |
| 2 inHg | 0.066842115 atm |
| 3 inHg | 0.100263172 atm |
| 5 inHg | 0.167105287 atm |
| 10 inHg | 0.334210574 atm |
| 20 inHg | 0.668421148 atm |
| 25 inHg | 0.835526435 atm |
| 50 inHg | 1.67105287 atm |
| 100 inHg | 3.342105739 atm |
| 250 inHg | 8.355264348 atm |
| 500 inHg | 16.710528696 atm |
| 1000 inHg | 33.421057393 atm |
Frequently asked questions
How do I convert atmospheres to inch of mercury?
Multiply the value in atmospheres by 29.92125558 to get the result in inch of mercury. For example, 5 atm × 29.92125558 = 149.606277899 inHg.
How many inch of mercury are in 1 atmospheres?
1 atmospheres (atm) is equal to 29.92125558 inch of mercury (inHg).
How do I convert inch of mercury back to atmospheres?
Use the inverse operation: divide the value in inch of mercury by 29.92125558 to get the result in atmospheres.
How accurate is the atmospheres to inch of mercury conversion?
The converter multiplies by the conversion factor 29.92125558 and rounds the result to 9 decimal places by default. You can increase or reduce the precision with the digits option on this page.
Sources
Conversion factors are based on internationally recognised standards:
- BIPM — The International System of Units (SI Brochure, 9th edition)
- ISO 80000-4:2019 — Quantities and units — Part 4: Mechanics
- NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically (NIST SP 811, 2008 edition)
- Resolution 4 of the 10th CGPM (1954): Definition of the standard atmosphere
