Convert Bar to Psi
1 bar equals 14.5038 psi.
Bar to Psi Converter
What Is a Bar?
The bar is a metric unit of pressure equal to 100,000 pascals (100 kPa). It is widely used in meteorology, engineering, and tire pressure specifications outside the US.
What Is a Psi?
Pounds per square inch (psi) is the standard pressure unit in the US. One psi equals one pound-force per square inch. It is used for tire pressure, hydraulics, and industrial applications.
Bar to Psi Formula
The conversion formula is:
psi = bar × 14.50377
Derived from: 1 bar = 100,000 Pa, and 1 psi ≈ 6,894.76 Pa.
Worked Example
Convert 2.4 bar (2.4 bar (European tire pressure)):
- Calculate: 2.4 → 34.81 psi
Common Use Cases
This conversion appears constantly in:
- Tire pressure: European vehicles specify tire pressure in bar (typically 2.0–2.5 bar), while US tire gauges read in psi (29–36 psi). Every international driver or tire technician converts between the two regularly.
- Industrial compressed air: Air compressor specifications in Europe use bar, while US manufacturers and OSHA regulations use psi. A typical shop compressor rated at 8 bar delivers about 116 psi.
- Hydraulic systems: Hydraulic equipment manufactured in Europe is rated in bar, but US field technicians and service manuals may use psi. A 200 bar hydraulic system operates at about 2,901 psi.
- SCUBA diving: European dive tanks are rated in bar (200–300 bar), while US divers use psi (3,000–4,500 psi). Dive computers and regulators may display either unit depending on market.
Frequently Asked Questions
How do I quickly estimate bar to psi?
Multiply by 14.5, or for a rougher estimate, multiply by 15 and subtract 3%. For example: 3 bar × 15 = 45, minus 3% ≈ 43.5 psi (exact: 43.51). For tire pressures (2–3 bar range), multiplying by 14.5 in your head works well.
Is 1 bar the same as 1 atmosphere?
Very close but not identical. 1 bar = 100,000 Pa, while 1 standard atmosphere (atm) = 101,325 Pa. The difference is about 1.3%. For most practical purposes they are interchangeable, but in precision scientific work the distinction matters.
What tire pressure is 2.2 bar in psi?
2.2 bar = approximately 31.9 psi (2.2 × 14.5038). This is a common front tire pressure for many European cars. The typical range of 2.0–2.8 bar corresponds to 29–40.6 psi. Always check your vehicle's door jamb sticker for the recommended pressure.
Why do different countries use bar vs. psi?
Bar is part of the metric system (derived from the CGS system) and became standard in countries that adopted SI units. PSI (pounds per square inch) comes from the imperial/US customary system. The US, UK, and a few other countries still use psi in everyday applications, while most of the world uses bar or kilopascals.
Common Bar to Psi Conversions
Bar to psi Conversion Table
Reference table with common bar to psi conversions. All values calculated with high precision.
Bar to Psi Table
0.0001 to 12
Bar to Psi Table
1 to 100000
Psi to Bar Table
0.01 to 50
Psi to Bar Table
100 to 10000000
Looking for the reverse? Convert Psi to Bar
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