mmHg to Atmosphere Converter
Enter a value to instantly convert between pressure units.
Precision4 dp
1 mmHg = 0.0013 Atmosphere
Key Formulas
Pound per Sq. Inch → Bar
bar = psi × 0.0689476Bar → Pound per Sq. Inch
psi = bar × 14.5038Atmosphere → Pound per Sq. Inch
psi = atm × 14.6959Pound per Sq. Inch → Atmosphere
atm = psi × 0.068046Formula
atm = mmHg × 0.00131579One mmHg (millimeter of mercury) equals approximately 133.322 pascals, and one atmosphere equals 101,325 pascals. The conversion ratio is 133.322 ÷ 101,325 = 0.00131579. This is commonly used in medical contexts (blood pressure) and vacuum systems.
Source: NIST SP 811
Frequently Asked Questions
Real-World Examples
760 mmHg equals exactly 1 atm.
760 mmHg = 1 atm
120 mmHg (systolic) is 0.158 atm.
120 mmHg = 0.1579 atm
80 mmHg (diastolic) is 0.105 atm.
80 mmHg = 0.1053 atm
380 mmHg is about 0.5 atm.
380 mmHg = 0.5 atm