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inHg to atm converter

1 inches of mercury equals 0.03342106 standard atmospheres. Conversions use atm = inHg × 0.033421

inHg → 0.03342106 atm

atm = inHg × 0.033421

Converter

Worked examples

1 inHg = 0.03342106 atm
2 inHg = 0.06684212 atm
5 inHg = 0.1671053 atm
10 inHg = 0.33421061 atm
100 inHg = 3.342106 atm

inches of mercury to standard atmospheres conversion table

inHg	atm	Arithmetic
1 inHg	0.03342106 atm	× 0.033421
2 inHg	0.06684212 atm	× 0.033421
3 inHg	0.10026318 atm	× 0.033421
4 inHg	0.13368424 atm	× 0.033421
5 inHg	0.1671053 atm	× 0.033421
6 inHg	0.20052637 atm	× 0.033421
8 inHg	0.26736849 atm	× 0.033421
10 inHg	0.33421061 atm	× 0.033421
12 inHg	0.40105273 atm	× 0.033421
15 inHg	0.50131591 atm	× 0.033421
20 inHg	0.66842122 atm	× 0.033421
25 inHg	0.83552652 atm	× 0.033421
30 inHg	1.002632 atm	× 0.033421
40 inHg	1.336842 atm	× 0.033421
50 inHg	1.671053 atm	× 0.033421
60 inHg	2.005264 atm	× 0.033421
70 inHg	2.339474 atm	× 0.033421
80 inHg	2.673685 atm	× 0.033421
90 inHg	3.007895 atm	× 0.033421
100 inHg	3.342106 atm	× 0.033421

How to convert inHg to atm

Take your value in inches of mercury.
Multiply by 0.033421
That is your answer in standard atmospheres — no rounding needed until you choose a display precision.

atm to inHg kPa to atm bar to atm psi to atm atm to kPa atm to bar atm to psi atm to mmHg atm to hPa all pressure units

Questions

How many standard atmospheres in 1 inches of mercury?

Exactly 0.03342106 atm. The factor follows from the definitions of both units, not from a measurement, so it is exact.

How do I convert inHg to atm?

Multiply the inches of mercury figure by 0.033421 — or use the converter above, which updates as you type.

Is inHg to atm the same as atm to inHg?

No — they are inverses. One inHg is 0.03342106 atm, while one atm is 29.921252 inHg.

What is 1 inHg in atm?

1 inHg = 0.03342106 atm (see the value page for the full arithmetic).