Bar to Atmosphere Converter
Enter a value to instantly convert between pressure units.
Precision4 dp
1 Bar = 0.9869 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 = bar × 0.986923One bar equals 100,000 pascals, while one atmosphere equals 101,325 pascals. The ratio is 100,000 ÷ 101,325 = 0.9869 atmospheres per bar. The bar (from Greek 'baros' meaning weight) is popular in meteorology because it's close to one atmosphere.
Source: NIST SP 811
Frequently Asked Questions
Real-World Examples
One bar is 0.987 atm — slightly less than atmospheric.
1 bar = 0.9869 atm
Two bar equals 1.97 atm.
2 bar = 1.9738 atm
10 bar equals 9.87 atm.
10 bar = 9.8692 atm
Half bar is 0.49 atm.
0.5 bar = 0.4935 atm