Bar versus PSI

Bar is the unit on most European door stickers and many digital gauges sold in the UK. PSI remains the language of forecourt compressors and American forums. Kilopascals appear on some Asian labels. Mixing them without converting is how 2.3 bar becomes “23 psi” in a Facebook group.

The conversions are linear. 1 bar equals 14.5038 psi. 1 psi equals 6.89476 kPa. 100 kPa is 1 bar. So 2.2 bar is about 32 psi and 220 kPa. 2.4 bar is about 35 psi. 2.5 bar is about 36 psi. 33 psi is about 2.28 bar.

A working garage table: 2.0 bar ≈ 29 psi; 2.3 bar ≈ 33 psi; 2.5 bar ≈ 36 psi; 2.8 bar ≈ 41 psi; 3.0 bar ≈ 44 psi. For commercials: 3.5 bar ≈ 51 psi; 4.1 bar ≈ 60 psi; 4.5 bar ≈ 65 psi.

Read the sticker’s unit first. VW, Peugeot, Renault and many Fords sold in Britain print bar to one decimal. A Focus handbook that says 2.3 / 2.3 is not inviting you to set 23 psi.

Calibrate a cheap stick gauge against a known digital once. Convert after you trust the reading, not before.