How many psi are in 1 bar?

1 bar equals 14.50377377 psi, using the exact defined conversion factor rather than an estimate.

How do I convert bar to psi?

Multiply the bar value by 14.50377377. The converter above does this instantly to whatever precision you set.

How do I convert psi back to bar?

Use the reverse factor: 1 psi equals 0.0689475729 bars. You can also use the swap control in the converter above to flip the direction instantly.

Is the bar to psi conversion exact?

Yes. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.

Bars to PSI Converter

Q: What is a bar?

Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.

Q: What is a psi?

PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.

About Converting Bars to PSI

Bar and PSI both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Bar is typically associated with widely used in Europe and most of the world for tire pressure, weather, and industrial pressure, while PSI is typically associated with united States (standard pressure unit for tires, tools, and plumbing).

Formula

psi = bars × 14.503773773

This factor comes from each unit's defined relationship to the category's base unit: 1 bar equals 100000 base units, and 1 psi equals 6894.75729317 base units, so dividing one by the other gives the direct bar-to-psi factor of 14.503773773.

Simple example

1 bar × 14.50377377 = 14.50377377 psi

1 bar = 14.50377377 psi.

Real-world example

35 bar × 14.50377377 = 507.6320821 psi

35 bars = 507.6320821 psi.

Conversion table

Bar (bar)	PSI (psi)
1 bar	14.50377377 psi
5 bar	72.51886887 psi
10 bar	145.0377377 psi
25 bar	362.5943443 psi
50 bar	725.1886887 psi
100 bar	1,450.377377 psi

Reverse conversion: PSI to Bar

14.50377377 psi × 0.06894757293 = 0.9999999998 bar

14.50377377 psi = 0.9999999998 bars.

bars = psi × 0.0689475729317

For a page dedicated to this direction, see PSI to Bar.

Bar vs. PSI

Aspect	Bar	PSI
Family	Non-SI metric unit accepted for use with SI	US/imperial customary unit
Typical use	Tire pressure specifications outside the US	Tire pressure specifications in the US
Where it's used	Widely used in Europe and most of the world for tire pressure, weather, and industrial pressure	United States (standard pressure unit for tires, tools, and plumbing)

Understanding the Bar

Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.

Where it's used: Widely used in Europe and most of the world for tire pressure, weather, and industrial pressure

Uses of the Bar today

Tire pressure specifications outside the US
Meteorology (weather maps commonly use millibars, hPa)
Industrial and hydraulic pressure ratings in metric-system countries

History of the Bar

The bar was proposed by Norwegian meteorologist Vilhelm Bjerknes around 1906 as a convenient round pressure unit close to atmospheric pressure, derived from the CGS unit system (one bar equals one million dynes per square centimeter).

Though not an SI unit, the bar remains in wide practical use, particularly in meteorology (as the millibar, now more often written as the equivalent hectopascal) and in tire and hydraulic pressure specifications across most of the world.

Historical origin. Bar was not the invention of a single named person; it developed through the process described above.

Understanding the PSI

PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.

Where it's used: United States (standard pressure unit for tires, tools, and plumbing)

Uses of the PSI today

Tire pressure specifications in the US
Hydraulic and pneumatic system ratings
Plumbing, compressed-air tools, and industrial equipment ratings

History of the PSI

PSI is a derived unit from the pound-force and the inch, both themselves standardized through English and later international agreements rather than invented as a pressure unit from scratch.

It became the default pressure unit in US engineering as pound-force and inch-based measurement dominated American industry through the 19th and 20th centuries, and it remains in everyday use for tires and tools even as most other measurements in the US context stay imperial.

Historical origin. PSI was not the invention of a single named person; it developed through the process described above.

Bar — sources

BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the bar among accepted non-SI pressure units.

PSI — sources

NIST Special Publication 811 — Guide for the Use of the International System of Units — Documents conversion factors for psi and other US customary pressure units.

Bars to PSI Converter — bar to psi

Pressure Converter