mmHg to atm Converter - Millimeters of Mercury to Standard Atmosphere

Millimeters of Mercury (mmHg) to Standard Atmosphere (atm)

Direct answer

1 mmHg = 0.001315785838 atm

atm = mmHg × 0.001315785838

Converter

Input

mmHg

Result

0.001315785838atm

atm = mmHg × 0.001315785838

mmHg = atm × 760.002100179

Example: 10 mmHg = 10 × 0.001315785838 = 0.013157858377 atm.

Express both mmHg and atm in the same base unit Pa (pascal), then cancel the shared base unit.

1
Rewrite mmHg in the base unit
$1 mmHg = 133.322 Pa$
2
Rewrite atm in the base unit
$1 atm = 101, 325 Pa$
3
Forward conversion
$1 mmHg = \frac{133.322 Pa}{101 , 325 Pa} \times 1 atm = \frac{133.322}{101 , 325} atm = 0.001315785838 atm$
4
Reverse conversion
$1 atm = \frac{101 , 325 Pa}{133.322 Pa} \times 1 mmHg = \frac{101 , 325}{133.322} mmHg = 760.002100179 mmHg$

A guarded explanation for this pair page covering definition, principle, assumptions, and cautions.

Guarded output

AI text is for interpretation only. The page calculator remains the source of truth for numeric results.

1 mmHg = 0.001315785838 atm.

10 mmHg = 0.013157858377 atm.

100 mmHg = 0.131578583765 atm.

Use atm = mmHg × 0.001315785838.

1 atm = 760.002100179 mmHg.

Use the conversion factor and round the result to the precision required by your calculation.