PSI to Bar: Tyres, Pumps and Pressure Gauges

By Hutu Laurentiu

4 min read · Updated October 2026

One bar is 14.5038 PSI — the pressure of the atmosphere measured in American units. Tyre pressure is where this conversion matters weekly: US gauges read PSI, European car doors stickers quote bar, and bicycles speak both.

The shortcut everyone can do

Bar × 14.5 = PSI, or backwards: PSI ÷ 14.5 ≈ bar. Even faster for tyres: bar × 2, drop a tenth. 2.3 bar → 4.6 → 4.6−0.3? No — the honest fast route: 2.3 bar is 33.4 PSI, and "bar × 14.5" is already easier than it looks if you remember 15−0.5: 2.3×15=34.5, minus 2.3×0.5=1.15 → 33.35. One multiply, one subtract, exact to a tenth.

The tyre-pressure table

• 2.0 bar = 29 PSI — small city cars, eco setting
• 2.2 bar = 32 PSI — most compact cars, full load
• 2.3 bar = 33 PSI — typical recommended sedan pressure
• 2.5 bar = 36 PSI — wagons/vans loaded
• 3.0 bar = 44 PSI — spare tyres, some performance cars cold

Cold matters: pressure rises ~0.1 bar per 10°C of driving heat. Check before driving, or subtract what the gauge gained.

Bicycles: where precision pays

Road bikes run 5-8 bar (75-115 PSI) — a whole different regime where a few PSI changes rolling resistance and pinch-flat risk. MTB: 1.5-2.5 bar (22-36 PSI). Hybrid: 3-4.5 bar (45-65 PSI). Cheap floor pumps show both scales; mini gauges are usually PSI-only — hence this conversion's weekly relevance for commuters.

Compressors, tanks and the other units

Air compressors: 8 bar ≈ 116 PSI (typical cutoff). Paint sprayers: 2-4 bar. scuba tanks: 200-232 bar (3000-3400 PSI) — here errors are safety-critical, so dive gauges are single-unit and certified. If a manual quotes PSI and your gauge shows bar, converting is fine for context; for anything pressurised above a few bar, use a gauge in the unit the equipment was certified with.

kPa, the third wheel

Some stickers (Japanese cars, Canada) quote kilopascals: 1 bar = 100 kPa, 1 PSI = 6.895 kPa. So 220 kPa = 2.2 bar = 32 PSI. Three units, one pressure — and now you can read any sticker in any parking lot.