Bar to psi
psi = bar × 100,000 ÷ 6,894.757 ≈ bar × 14.503774
Factor rounded to six decimals, derived from the definitions in pascals.
Bar to PSI converter (and PSI to bar)
Two-way bar ↔ psi converter: exact definitions (1 bar = 100,000 Pa, 1 psi = 6,894.757 Pa), formulas, a mental-math shortcut, gauge vs absolute pressure, and real examples (tires, pressure washers, scuba tanks).
Conversion table
| bar | psi |
|---|---|
| 0.5 bar | 7.25189 psi |
| 1 bar | 14.5038 psi |
| 1.5 bar | 21.7557 psi |
| 2 bar | 29.0075 psi |
| 2.2 bar | 31.9083 psi |
| 2.5 bar | 36.2594 psi |
| 3 bar | 43.5113 psi |
| 3.5 bar | 50.7632 psi |
| 5 bar | 72.5189 psi |
| 10 bar | 145.038 psi |
| 200 bar | 2,900.75 psi |
| psi | bar |
|---|---|
| 10 psi | 0.6895 bar |
| 15 psi | 1.03421 bar |
| 20 psi | 1.37895 bar |
| 30 psi | 2.06843 bar |
| 32 psi | 2.20632 bar |
| 35 psi | 2.41317 bar |
| 40 psi | 2.7579 bar |
| 50 psi | 3.44738 bar |
| 100 psi | 6.89476 bar |
| 3,000 psi | 206.843 bar |
Was this tool useful?
How does this tool work?
This converter turns a pressure in bar into pounds per square inch (psi) and back: type a value in either field and the other updates instantly. Use it when a European car manual gives tire pressures in bar but your gauge reads psi, to compare pressure washers and air compressors sold with metric specs, or to read a scuba tank rating quoted in the other unit.
The bar is a metric unit defined as exactly 100,000 pascals (10⁵ Pa), which is 100 kPa or 0.1 MPa. The psi (pound-force per square inch) is the force of one pound-force (0.45359237 kg × 9.80665 m/s²) spread over one square inch (6.4516 cm²): 1 psi = 6,894.757293168 Pa. That gives 1 bar ≈ 14.503774 psi and 1 psi ≈ 0.0689476 bar.
To go from bar to psi, multiply by 14.503774; to go from psi to bar, multiply by 0.0689476 (or divide by 14.503774). Both fields stay in sync, and the double arrow flips the direction without losing your value.
For a quick estimate, multiply bar by 14.5: 2 bar ≈ 29 psi, 10 bar ≈ 145 psi. The other way, divide psi by 14.5, or roughly by 15: 30 psi ≈ 2 bar (exactly 2.07). It also helps to remember that 1 bar is close to 1 atmosphere (1 atm = 1.01325 bar ≈ 14.7 psi).
Watch the reference point. A tire gauge shows gauge pressure, measured above atmospheric pressure (psig, barg), while absolute pressure (psia, bara) includes the atmosphere. A tire at 32 psig is really at about 46.7 psia. The bar ↔ psi factor is the same for both, but never mix a gauge value with an absolute one.
How to use this tool
Enter a pressure
Use the Bar field or the PSI field; decimals work, so 2.4 bar or 32.5 psi are fine.
Check the units
The dropdowns let you put bar and psi back on each side if you swapped them.
Scan the table
Below the converter, the table lists common tire, compressor and tank pressures in both directions.
Bar ↔ psi conversion formulas
Both units are defined exactly from the pascal, the SI unit of pressure.
Psi to bar
bar = psi × 0.0689476
Same as dividing by 14.503774.
Definition of the psi
1 psi = 1 lbf ÷ 1 in² = 4.4482216 N ÷ 0.00064516 m² ≈ 6,894.757 Pa
A pound-force is the weight of one pound (0.45359237 kg) under standard gravity, 9.80665 m/s².
- bar
- pressure in bar (1 bar = 100,000 Pa = 100 kPa)
- psi
- pressure in pounds-force per square inch
- Pa
- pascal, the SI unit of pressure (1 N/m²)
Example: 3 bar = 3 × 14.503774 ≈ 43.51 psi.
Use cases
Tire inflation
Apply a manufacturer pressure given in bar when your gauge or the gas station pump only shows psi, or the reverse when traveling in Europe.
Tools and equipment
Compare air compressors, pressure washers, pumps and pneumatic tools whose spec sheets mix bar and psi.
Diving and compressed gas
Translate a tank or regulator working pressure between the European (bar) and US (psi) conventions.
Cycling
Set road, gravel or mountain bike tire pressure from a sidewall or a chart printed in the other unit.
Examples
European car manual
2.3 × 14.503774 ≈ 33.36 psi, so you would set your gauge to 33 psi.
Input
2.3 barResult
33.4 psiDoor placard pressure
35 × 0.0689476 ≈ 2.413 bar, useful when renting a car in Europe with a metric pump.
Input
35 psiResult
2.41 barRoad bike tire
100 × 0.0689476 = 6.895 bar, a classic pressure for 25 mm tires.
Input
100 psiResult
6.89 barPressure washer
150 × 14.503774 ≈ 2,175.57 psi, the class US brands market as about 2,100 to 2,200 psi.
Input
150 barResult
2,175.6 psiScuba tank
3,000 × 0.0689476 ≈ 206.84 bar; a European tank filled to 200 bar holds about 2,901 psi.
Input
3,000 psiResult
206.8 barTips and best practices
- Quick anchors: 1 bar ≈ 14.5 psi and 1 psi ≈ 0.069 bar; 2 bar ≈ 29 psi, 3 bar ≈ 43.5 psi.
- Check tire pressure cold: after a drive it can rise by 3 to 4 psi (0.2 to 0.3 bar) and you should not let air out.
- To get kilopascals, multiply bar by 100: 2.5 bar = 250 kPa; there is also a dedicated psi ↔ kPa converter.
- On spec sheets, psig and barg mean gauge pressure, psia and bara mean absolute pressure.
- To double-check a result, convert it back: you should land on your starting value.
Sources and references
- NIST, Guide for the Use of the International System of Units (SP 811), Appendix B.8: Factors for Units Listed Alphabetically (opens in a new tab)Page in English
- BIPM, The International System of Units (SI Brochure) (opens in a new tab), Bureau international des poids et mesuresPage in English
Frequently asked questions
How many psi are in 1 bar?
One bar is about 14.5038 psi. It follows from the exact definitions 1 bar = 100,000 Pa and 1 psi = 6,894.757293168 Pa.
What is 2.5 bar in psi?
2.5 bar is about 36.26 psi (2.5 × 14.503774), a typical pressure for a loaded car tire.
How do I convert psi to bar?
Multiply psi by 0.0689476, or divide by 14.5038. For example, 32 psi is 2.206 bar and 44 psi is 3.034 bar.
Is 1 bar the same as 1 atmosphere?
Almost: 1 atm = 101,325 Pa = 1.01325 bar ≈ 14.696 psi, while 1 bar = 100,000 Pa ≈ 14.504 psi. The gap is about 1.3%.
What is the difference between psig and psia?
Psig (gauge) is measured above atmospheric pressure, like a tire gauge. Psia (absolute) includes the atmosphere, about 14.7 psi at sea level, so 30 psig ≈ 44.7 psia.
Related tools
Keep going with these tools
Tools similar or complementary to this one.
Similar tools
Convert pressure from psi to kilopascals and back with the factor 1 psi = 6.894757 kPa and a table of common pressures.
Mathematics & calculationUse this tool
Convert kilograms to pounds (lb) and pounds to kilograms with the exact factor 1 lb = 0.45359237 kg, plus a table of common values.
Mathematics & calculationUse this tool
Convert degrees Celsius to Fahrenheit and back with the exact formula °F = °C × 1.8 + 32, plus a table of common temperatures.
Mathematics & calculationFeaturedUse this tool
Read next
GuideConcepts and technologiesBeginner
Unit conversion: complete guide to measurements and common equivalents
Understand and convert length, mass, volume, temperature, speed, pressure, energy, digital storage and many other units with practical examples.
10 August 20265 min