Atmosphere to Bar Converter
Enter a value to instantly convert between pressure units.
Precision4 dp
1 Atmosphere = 1.0132 Bar
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
bar = atm × 1.01325One atmosphere (standard sea-level pressure) equals 101,325 pascals. Since one bar equals 100,000 pascals, the conversion is 101,325 ÷ 100,000 = 1.01325 bar per atmosphere. This small difference matters in precision work but is often rounded in everyday applications.
Source: NIST SP 811
Frequently Asked Questions
Real-World Examples
One atmosphere equals 1.01325 bar — nearly equal, just 1.3% higher.
1 atm = 1.01325 bar
Two atmospheres equals 2.027 bar.
2 atm = 2.0265 bar
Half an atmosphere equals 0.507 bar.
0.5 atm = 0.5066 bar
10 atm equals 10.13 bar — deep dive pressure.
10 atm = 10.1325 bar