⚖️ Comparison · Updated for 2026

Bar vs PSI

Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.

Quick answer: 1 bar = 14.5 psi. Bar is metric (1 bar ≈ atmospheric pressure at sea level). PSI is imperial. UK car tyres are usually 32-36 psi (2.2-2.5 bar). German owner manuals use bar; American manuals use psi.
Decision guide — when to use which
Use Bar when…

European car manuals (universal), industrial pressure systems in metric countries, scuba diving worldwide.

Use PSI when…

US car manuals, US plumbing and industrial systems, UK car tyres (signs at petrol stations), refrigeration in US.

📊 Side-by-side comparison
Aspect Bar PSI
Definition 100,000 pascals (≈ 1 atmosphere) Pounds per square inch
Car tyre typical 2.2 - 2.5 bar 32 - 36 psi
1 atmosphere 1.013 bar 14.7 psi
Scuba diving 200-300 bar (cylinder) 2,900-4,400 psi

Frequently asked

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What's 35 psi in bar?

35 psi = 2.41 bar. Most modern petrol stations in the UK have gauges marked in both, so this matters less than it used to.

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Is bar an SI unit?

No — the SI pressure unit is the pascal (Pa). 1 bar = 100,000 Pa. Bar is widely tolerated alongside SI because the numbers are more practical for engineering.

Reviewed for 2026. This comparison is general guidance based on publicly available information. Prices, rates, rules and specifications change, so check current details with the provider or an official source before making a decision. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.

Frequently asked questions

What's 35 psi in bar?

35 psi = 2.41 bar. Most modern petrol stations in the UK have gauges marked in both, so this matters less than it used to.

Is bar an SI unit?

No — the SI pressure unit is the pascal (Pa). 1 bar = 100,000 Pa. Bar is widely tolerated alongside SI because the numbers are more practical for engineering.