Skip to content

mmHg to atm converter

1 millimeters of mercury equals 0.0013157897 standard atmospheres. Conversions use atm = mmHg × 0.001316

mmHg → 0.0013157897 atm

atm = mmHg × 0.001316

Converter

Worked examples

1 mmHg = 0.0013157897 atm
2 mmHg = 0.0026315793 atm
5 mmHg = 0.0065789483 atm
10 mmHg = 0.0131579 atm
100 mmHg = 0.13157897 atm

millimeters of mercury to standard atmospheres conversion table

mmHg	atm	Arithmetic
1 mmHg	0.0013157897 atm	× 0.001316
2 mmHg	0.0026315793 atm	× 0.001316
3 mmHg	0.003947369 atm	× 0.001316
4 mmHg	0.0052631586 atm	× 0.001316
5 mmHg	0.0065789483 atm	× 0.001316
6 mmHg	0.007894738 atm	× 0.001316
8 mmHg	0.01052632 atm	× 0.001316
10 mmHg	0.0131579 atm	× 0.001316
12 mmHg	0.01578948 atm	× 0.001316
15 mmHg	0.01973684 atm	× 0.001316
20 mmHg	0.02631579 atm	× 0.001316
25 mmHg	0.03289474 atm	× 0.001316
30 mmHg	0.03947369 atm	× 0.001316
40 mmHg	0.05263159 atm	× 0.001316
50 mmHg	0.06578948 atm	× 0.001316
60 mmHg	0.07894738 atm	× 0.001316
70 mmHg	0.09210528 atm	× 0.001316
80 mmHg	0.10526317 atm	× 0.001316
90 mmHg	0.11842107 atm	× 0.001316
100 mmHg	0.13157897 atm	× 0.001316

How to convert mmHg to atm

Take your value in millimeters of mercury.
Multiply by 0.001316
That is your answer in standard atmospheres — no rounding needed until you choose a display precision.

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

Questions

How many standard atmospheres in 1 millimeters of mercury?

Exactly 0.0013157897 atm. The factor follows from the definitions of both units, not from a measurement, so it is exact.

How do I convert mmHg to atm?

Multiply the millimeters of mercury figure by 0.001316 — or use the converter above, which updates as you type.

Is mmHg to atm the same as atm to mmHg?

No — they are inverses. One mmHg is 0.0013157897 atm, while one atm is 760 mmHg.

What is 1 mmHg in atm?

1 mmHg = 0.0013157897 atm (see the value page for the full arithmetic).