My air compressor is rated 8 bar. What's that in psi?

8 bar × 14.504 = 116 psi. Always check the manual's max operating pressure before connecting equipment. For the reverse, use psi to bar.

What's the difference between bar and mbar?

1 bar = 1,000 mbar (millibar). 1 mbar = 0.01450 psi.

1 bar is defined as 100,000 Pa and 1 atm as 101,325 Pa. The values differ by about 1.3%, so 1 atm ≈ 1.013 bar.

Rough estimate: multiply bar by 15 for a ballpark. Example: 3 bar × 15 ≈ 45 psi (actual: 43.5). For accuracy, use 14.504.

Enter a value to instantly convert between pressure units.

From

Precision4 dp

1 Bar = 14.5038 Pound per Sq. Inch

Pound per Sq. Inch → Bar

bar = psi × 0.0689476

Bar → Pound per Sq. Inch

psi = bar × 14.5038

Atmosphere → Pound per Sq. Inch

psi = atm × 14.6959

Pound per Sq. Inch → Atmosphere

atm = psi × 0.068046

psi = bar × 14.50377

Bar is a metric pressure unit defined as 100,000 Pa. PSI is an inch-pound unit. Convert between them when two documents use different units.

Reviewed by the Convert Calc editorial team · Last reviewed: 2026-10-06 · see our methodology

Example tire pressure of 2.2 bar. Use the value on your vehicle's placard.

2.2 bar = 31.9 psi

One bar, close to sea-level air pressure (1.013 bar, or 14.7 psi). 1 bar is about 14.5 psi.

1 bar = 14.5 psi

Example compressor setting of 6 bar, about 87 psi.

6 bar = 87 psi

Hose or fitting rating. A part marked 3.5 bar is rated for about 50.8 psi.

3.5 bar = 50.8 psi