atm to inHg Converter

How to convert atmospheres to inches of mercury

FormulainHg = atm × 29.92125558

Multiply the value in atmospheres by 29.92125558. To go the other way, multiply by 0.03342105739 (or divide by 29.92125558).

A standard atmosphere is larger than an inch of mercury: one standard atmosphere contains 29.92125558 inches of mercury.

Worked examples

1 standard atmosphere1 atm × 29.92125558 = 29.92125558 inHg
5 atmospheres5 atm × 29.92125558 = 149.6062779 inHg
10 atmospheres10 atm × 29.92125558 = 299.2125558 inHg
20 atmospheres20 atm × 29.92125558 = 598.4251116 inHg
100 atmospheres100 atm × 29.92125558 = 2,992.125558 inHg

Atmospheres to inches of mercury conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Atmospheres to inches of mercury: 0.1–10 atm
Atmospheres (atm)	Inches of mercury (inHg)
0.1 atm	2.9921256 inHg
0.25 atm	7.4803139 inHg
0.5 atm	14.960628 inHg
1 atm	29.921256 inHg
2 atm	59.842511 inHg
3 atm	89.763767 inHg
4 atm	119.68502 inHg
5 atm	149.60628 inHg
6 atm	179.52753 inHg
7 atm	209.44879 inHg
8 atm	239.37004 inHg
9 atm	269.2913 inHg
10 atm	299.21256 inHg

Atmospheres to inches of mercury: 12–1,000 atm
Atmospheres (atm)	Inches of mercury (inHg)
12 atm	359.05507 inHg
15 atm	448.81883 inHg
20 atm	598.42511 inHg
25 atm	748.03139 inHg
30 atm	897.63767 inHg
40 atm	1,196.8502 inHg
50 atm	1,496.0628 inHg
75 atm	2,244.0942 inHg
100 atm	2,992.1256 inHg
250 atm	7,480.3139 inHg
500 atm	14,960.628 inHg
1,000 atm	29,921.256 inHg

About the units

Standard atmosphere (atm)

Exactly 101,325 Pa — average sea-level air pressure.

Inch of mercury (inHg)

About 3,386.39 Pa. US weather reports and aircraft altimeters use inches of mercury (standard is 29.92 inHg). One inch of mercury equals 3,386.38864 pascals (Pa).

Frequently asked questions

How many inches of mercury are in one standard atmosphere?

There are 29.92125558 inches of mercury in one standard atmosphere, and this value is exact by definition.

How do I convert atmospheres to inches of mercury?

Multiply the number of atmospheres by 29.92125558. For example, 10 atm × 29.92125558 = 299.2125558 inHg.

How many atmospheres are in one inch of mercury?

One inch of mercury equals 0.03342105739 atmospheres. That is the reverse factor, 1 ÷ 29.92125558.

What is 10 atmospheres in inches of mercury?

10 atm = 299.2125558 inHg.

Is this atm to inHg converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.