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Atmospheres to Inches Of Mercury Converter

29.9212556

1 atm = 29.9212556 inHg

How to convert atmospheres to inches of mercury

inches of mercury = atmospheres × 29.9212556

To convert atmospheres to inches of mercury, multiply the number of atmospheres by 29.9212556.

1 atm = 29.9212556 inHg

Examples

  • Standard sea-level atmospheric pressure: 1 atm × 29.9212556 = 29.9212556 inHg
  • 2 atm × 29.9212556 = 59.8425112 inHg

Good to know

This is the standard atmosphere (atm), exactly 101,325 Pa. It is not the technical atmosphere (at), which is 1 kgf/cm² or 98,066.5 Pa.

This is the conventional inch of mercury, about 3386.389 Pa. Values defined at a specific mercury temperature differ slightly, for example 3376.85 Pa at 60 °F.

Atmospheres to inches of mercury conversion table

Atmospheres (atm) Inches of mercury (inHg)
0.1 atm 2.99212556 inHg
0.25 atm 7.48031389 inHg
0.5 atm 14.9606278 inHg
0.75 atm 22.4409417 inHg
1 atm 29.9212556 inHg
1.5 atm 44.8818834 inHg
2 atm 59.8425112 inHg
3 atm 89.7637667 inHg
4 atm 119.685022 inHg
5 atm 149.606278 inHg
10 atm 299.212556 inHg
20 atm 598.425112 inHg
50 atm 1,496.06278 inHg
100 atm 2,992.12556 inHg

Unit definitions

Atmosphere (atm)
The standard atmosphere is defined as exactly 101,325 pascals, approximately the average air pressure at sea level. It is used as a reference pressure in chemistry and physics.
Inch of mercury (inHg)
An inch of mercury is the pressure exerted by a 1 inch column of mercury, conventionally about 3386.389 pascals. It is used in the United States for barometric pressure in weather reports and aviation.

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