2 pounds per square inch is 0.1378951459 bar. The exact arithmetic is 2 × 0.06894757293 = 0.137895145863 bar, using the defined factor rather than a rounded one, so this matches what a calibrated instrument would give you.
2 psi is 0.1379 bar and 13.79 kPa. Passenger-car placards normally sit between 30 and 36 psi cold, road bicycle tyres between 80 and 110, and domestic mains water between 40 and 70 — so the same number means very different things depending on what is being inflated.
The result sits 0.1121 bar short of 0.25 bar, so if you need a round figure to quote, 0.25 bar is the honest nearest one. Plenty of people do this in their head: divide by 15 instead of using the exact factor 0.06894757293. At 2 that shortcut gives 0.13333333 bar, off by 0.004562 bar or about 3.31%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
The formula
2 psi- The quantity being converted
0.06894757293- Exact bar in one pound per square inch
0.1378951459 bar- The converted result
How it works, step by step
- Begin from the figure you have: 2 pounds per square inch.
- Scale it by 0.06894757293 — that is how many bar fit in a single pound per square inch.
- The product is 0.137895145863 bar.
- Going the other way, divide rather than multiply — 0.1378951459 bar ÷ 0.06894757293 brings you back to 2 psi.
Worked examples
The calculation
2 psi × 0.06894757293 = 0.137895145863 bar. One multiplication, with no rounding until the value reaches the screen.
Checking it backwards
Divide the answer back: 0.1378951459 bar ÷ 0.06894757293 returns 2 psi. If a converter fails this test it has inverted the factor, which is the single most common conversion error there is.
How to read your score
Frequently asked questions
What is 2 pounds per square inch in bar?
The answer is 0.1378951459 bar — or 0.137895145863 bar before any rounding.
How do you convert pounds per square inch to bar?
Use the factor 0.06894757293 as a multiplier — 2 × 0.06894757293 gives 0.1378951459 bar. The same factor works at any scale because the relationship is linear.
What is 0.1378951459 bar back in pounds per square inch?
It goes back to 2 pounds per square inch. The reciprocal of the factor is 14.50377377, so multiplying by that works just as well as dividing.
Is 2 psi a lot?
2 psi is 0.1379 bar and 13.79 kPa. Passenger-car placards normally sit between 30 and 36 psi cold, road bicycle tyres between 80 and 110, and domestic mains water between 40 and 70 — so the same number means very different things depending on what is being inflated. The reference table shows the values either side of it for comparison.
What is a pound per square inch?
The dominant US pressure unit for tyres, plumbing and compressors.
What is a bar?
Almost exactly atmospheric pressure; standard in European industry and diving.
2 psi in bar — nearby values
| Pounds Per Square Inch | Bar | Unrounded |
|---|---|---|
| 1 psi | 0.068947573 | 0.06894757293 |
| 2 psi | 0.13789515 | 0.1378951459 |
| 3 psi | 0.20684272 | 0.2068427188 |
| 4 psi | 0.27579029 | 0.2757902917 |
| 5 psi | 0.34473786 | 0.3447378647 |
| 6 psi | 0.41368544 | 0.4136854376 |
| 7 psi | 0.48263301 | 0.4826330105 |
| 8 psi | 0.55158058 | 0.5515805835 |
| 9 psi | 0.62052816 | 0.6205281564 |
| 10 psi | 0.68947573 | 0.6894757293 |
| 11 psi | 0.7584233 | 0.7584233022 |
| 12 psi | 0.82737088 | 0.8273708752 |
| 13 psi | 0.89631845 | 0.8963184481 |
Exact factor: 1 pound per square inch = 0.0689475729317 bar. The row for 2 psi is the value this page is about.