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Inches Of Mercury to Atmospheres Converter

0.0334210574

1 inHg = 0.0334210574 atm

How to convert inches of mercury to atmospheres

atmospheres = inches of mercury ÷ 29.9212556

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

1 inHg = 0.0334210574 atm

Examples

  • Standard sea-level atmospheric pressure, as used for altimeter settings: 29.92 inHg ÷ 29.9212556 = 0.999958037 atm
  • 30 inHg ÷ 29.9212556 = 1.00263172 atm

Good to know

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.

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.

Inches of mercury to atmospheres conversion table

Inches of mercury (inHg) Atmospheres (atm)
1 inHg 0.0334210574 atm
5 inHg 0.167105287 atm
10 inHg 0.334210574 atm
20 inHg 0.668421148 atm
25 inHg 0.835526435 atm
28 inHg 0.935789607 atm
29 inHg 0.969210664 atm
29.5 inHg 0.985921193 atm
29.92 inHg 0.999958037 atm
30 inHg 1.00263172 atm
30.5 inHg 1.01934225 atm
31 inHg 1.03605278 atm
32 inHg 1.06947384 atm
35 inHg 1.16973701 atm

Unit definitions

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.
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.

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