Millibar to Atmosphere Converter
Enter a value to instantly convert between pressure units.
Precision4 dp
1 Millibar = 0.001 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 = mbar × 0.000986923One millibar equals 100 pascals, and one atmosphere equals 101,325 pascals. The ratio is 100 ÷ 101,325 = 0.0009869 atmospheres per millibar. This is essentially the inverse of the 1013.25 mbar per atm conversion.
Source: NIST SP 811
Frequently Asked Questions
Real-World Examples
1013.25 mbar equals exactly 1 atm.
1013.25 mbar = 1 atm
500 mbar is about 0.49 atm.
500 mbar = 0.4935 atm
1000 mbar equals 0.987 atm.
1000 mbar = 0.9869 atm
101.325 mbar is 0.1 atm.
101.325 mbar = 0.1 atm