Atmosphere to Millibar Converter
Enter a value to instantly convert between pressure units.
Precision4 dp
1 Atmosphere = 1013.25 Millibar
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
mbar = atm × 1013.25One atmosphere equals 101,325 pascals, and one millibar equals 100 pascals. Dividing 101,325 by 100 gives 1,013.25 millibars per atmosphere. Weather reports worldwide use millibars as the standard pressure unit.
Source: NIST SP 811
Frequently Asked Questions
Real-World Examples
Standard sea-level pressure: 1013.25 mbar.
1 atm = 1013.25 mbar
Half atmosphere is about 507 mbar.
0.5 atm = 506.625 mbar
Two atmospheres is 2026.5 mbar.
2 atm = 2026.5 mbar
Quarter atmosphere equals 253.3 mbar.
0.25 atm = 253.3125 mbar