Convert between bar and PSI (pounds per square inch) with bidirectional conversion, reference table for tires, hydraulics, and industrial applications.
Bar and PSI (pounds per square inch) are the two most common pressure units used in everyday applications like tire inflation, hydraulic systems, and compressed air equipment. In Europe and most of the world, pressure is specified in bar, while the United States predominantly uses PSI. The conversion factor is 1 bar = 14.5038 PSI.
This bidirectional converter lets you switch between bar and PSI instantly. It also shows related units including atmospheres, kilopascals, Pascals, and mmHg, which is useful when you are comparing a workshop gauge with a manual or a spec sheet that uses a different unit family. The reference table covers common applications from car tires to hydraulic presses, so the page works as both a converter and a quick sanity check.
Whether you are inflating tires at a European gas station, reading specifications for imported equipment, comparing pressure washer ratings, or setting up an espresso machine, this tool bridges the gap between metric and imperial pressure units and helps avoid mistakes in maintenance, setup, and safety checks. It is especially handy when you need to translate a value on the fly without reaching for a separate pressure chart.
Tire gauges, compressors, and industrial equipment may be labeled in either bar or PSI depending on the country of manufacture. This converter provides instant, accurate translations plus a reference table of common pressures so you can quickly tell whether a reading is in the expected range.
It is useful because the same practical pressure can look unfamiliar when written in the other unit system. Seeing bar, PSI, kPa, atm, and related equivalents together reduces setup mistakes and makes cross-region equipment specs easier to compare, especially when you are matching a gauge to a printed specification or checking an operating limit.
Bar to PSI: psi = bar × 14.5038 PSI to Bar: bar = psi ÷ 14.5038 Bar to kPa: kPa = bar × 100 Bar to atm: atm = bar ÷ 1.01325
Result: 31.91 psi
2.2 bar is a typical car tire pressure. Using the formula: 2.2 × 14.5038 = 31.91 psi. Most US tire gauges would show about 32 psi for fully inflated passenger car tires.
The most common encounter with bar and PSI conversions is tire inflation. European cars and tire gauges use bar, while American ones use PSI. Getting this conversion wrong can lead to over- or under-inflated tires, affecting fuel economy, tire wear, and safety.
Hydraulic systems, pneumatic tools, and pressure vessels may be rated in either unit. European-made equipment typically uses bar, while American equipment uses PSI. When sourcing components internationally, accurate conversion prevents costly mismatches.
Bar has a clean relationship to SI units: 1 bar = exactly 100,000 Pa = 100 kPa. This makes calculations straightforward. PSI requires conversion factors that are not round numbers, making metric calculations more cumbersome.
1 bar equals 14.5038 PSI. That makes it easy to compare metric labels with US-style gauges without losing much precision.
Multiply the bar value by 14.5038. For example, 3 bar × 14.5038 = 43.51 PSI, which is close enough for most maintenance work and exact enough for spec comparison.
A typical passenger car tire runs at 2.0-2.5 bar (29-36 PSI). The exact recommendation is on the sticker inside the driver's door, and the vehicle maker may choose bar or PSI depending on the market.
Both units are equally precise, because accuracy depends on the measuring instrument rather than the unit. Bar is part of the metric system and integrates cleanly with Pascals, while PSI is more common in US mechanical work.
A proper espresso machine brews at about 9 bar (130 PSI). That pressure forces hot water through finely ground coffee in 25-30 seconds, which is what creates the crema and extraction profile.
Divide the PSI value by 14.5038. For example, 32 PSI ÷ 14.5038 = 2.206 bar, which is why many tire charts can be cross-checked quickly in either unit.