Bar to psi conversion (bar to psi) pressure converter
What are bar and psi?
Bar
The bar is a metric unit of pressure defined as exactly 100,000 pascals (100 kPa). It is not part of the SI system but is widely tolerated for everyday use, and it sits very close to one standard atmosphere (about 1.01325 bar). Because one bar is roughly the pressure of the air around us at sea level, the unit is convenient and intuitive. You will find it on European tire gauges, weather reports, diving equipment, and industrial machinery throughout much of the world.
Pounds per square inch (psi)
The pound per square inch, abbreviated psi, is the customary unit of pressure in the imperial and United States systems. It expresses the force in pounds applied over an area of one square inch. Psi dominates American engineering, plumbing, and automotive specifications, so tire placards, air compressors, and hydraulic ratings in the United States are routinely quoted in this unit.
How does the calculator work?
This converter links bar and psi together. Enter a value in either field and the other updates instantly. The tool tracks which field you changed last and converts from it to the other, so both values stay consistent in every direction.
The conversion uses a precise factor. One bar equals about 14.5037738 psi, and conversely one psi equals about 0.0689476 bar.
Bar and psi conversion formulas
To convert bar to psi, multiply by 14.5037738:
To convert psi back to bar, divide by the same factor:
Conversion table
The table below summarizes how bar and psi relate to each other.
| Pressure | Bar | Pounds per square inch (psi) |
|---|---|---|
| 1 bar | 1 | 14.5037738 |
| 1 psi | 0.0689476 | 1 |
For other force and pressure conversions, use the pressure unit converter.
Examples
The following examples reuse the same numbers as the calculator’s test fixtures.
Example 1: Convert 1 bar to psi
Starting from a single bar:
So 1 bar is about 14.50 psi.
Example 2: Convert 100 bar to psi
For a larger pressure value typical of industrial systems:
Thus 100 bar equals about 1450.38 psi.
Example 3: Convert 30 psi to bar
Working in the other direction, using a common tire pressure:
So 30 psi is about 2.07 bar.
Practical applications
Pressure conversion matters most where metric and imperial systems meet. Drivers comparing a European tire placard in bar with an American gauge in psi need the conversion to inflate tires correctly, since under- or over-inflation affects safety and fuel economy.
In industry, compressors, hydraulics, and pneumatic tools are rated in either unit depending on the manufacturer’s region, so engineers and technicians convert between bar and psi to size equipment and set safe operating limits.
Divers, plumbers, and HVAC specialists also move between the two units when reading gauges, specifying components, or following instructions written for a different market, avoiding mistakes that could compromise safety or performance.
Frequently asked questions
How do I convert bar to psi?
Multiply the bar value by 14.5037738. For example, 100 bar × 14.5037738 ≈ 1450.38 psi.
How many psi are in one bar?
One bar equals about 14.5038 psi.
How do I convert psi to bar?
Divide the psi value by 14.5037738, or equivalently multiply by about 0.0689476. For example, 30 psi ÷ 14.5037738 ≈ 2.07 bar.
Is one bar the same as one atmosphere?
No, but they are close. One bar equals 100,000 pascals, while one standard atmosphere equals 101,325 pascals, so one atmosphere is about 1.01325 bar.
Why is psi still common if bar is metric?
Psi remains the customary pressure unit in the United States, so it dominates American tire placards, compressors, and hydraulic specifications, while bar is favored in metric regions.
What is a typical car tire pressure in bar and psi?
A common passenger-car tire pressure of about 32 psi corresponds to roughly 2.21 bar, though you should always follow the value printed on your vehicle’s placard.