How Do You Convert PSI to Bar? (psi to bar Explained)
Quick answer: one pound per square inch equals 0.068948 bars (and one bar is 14.5038 pounds per square inch). To convert any value, multiply your pounds per square inch by 0.06894757.
Few conversions come up as often as pounds per square inch to bars. Recipes, travel, product listings and school assignments all mix the two, and getting the factor slightly wrong compounds quickly when the numbers get big. This guide gives you the exact factor, the mental shortcut, worked examples, and reference tables you can bookmark.
Understanding the units
Pound per square inch (psi)
PSI is the imperial pressure unit of American tire gauges (32–35 psi for cars) and industrial equipment.
Bar (bar)
The bar (100,000 Pa) sits conveniently close to one atmosphere, which made it the favorite of meteorologists and scuba divers.
The exact conversion formula
bars = pounds per square inch × 0.0689475729How to convert pounds per square inch to bars, step by step
- Take your value in pounds per square inch.
- Multiply by 0.06894757 (the number of bars in one pound per square inch).
- Round sensibly for your context — engineering needs more decimals than a shopping list.
Worked examples:
- 5 pounds per square inch × 0.068948 = 0.344738 bars
- 12 pounds per square inch × 0.068948 = 0.827371 bars
- 50 pounds per square inch × 0.068948 = 3.4474 bars
- 365 pounds per square inch × 0.068948 = 25.1659 bars
Real-world reference points
Pressure anchors: sea-level atmosphere is 101.325 kPa (14.7 psi, 1.013 bar), car tires run 30–35 psi (about 2.2 bar), a bicycle tire 60–100 psi, an espresso machine brews at 9 bar, and every 10 meters of water depth adds about one atmosphere of pressure.
Quick lookup: 1 to 100 pounds per square inch in bars
Scan this list for the exact value you need — each line is computed with the precise conversion factor, not an approximation.
- 1 pound per square inch = 0.068948 bars
- 2 pounds per square inch = 0.137895 bars
- 3 pounds per square inch = 0.206843 bars
- 4 pounds per square inch = 0.27579 bars
- 5 pounds per square inch = 0.344738 bars
- 6 pounds per square inch = 0.413685 bars
- 7 pounds per square inch = 0.482633 bars
- 8 pounds per square inch = 0.551581 bars
- 9 pounds per square inch = 0.620528 bars
- 10 pounds per square inch = 0.689476 bars
- 11 pounds per square inch = 0.758423 bars
- 12 pounds per square inch = 0.827371 bars
- 13 pounds per square inch = 0.896318 bars
- 14 pounds per square inch = 0.965266 bars
- 15 pounds per square inch = 1.0342 bars
- 16 pounds per square inch = 1.1032 bars
- 17 pounds per square inch = 1.1721 bars
- 18 pounds per square inch = 1.2411 bars
- 19 pounds per square inch = 1.31 bars
- 20 pounds per square inch = 1.379 bars
- 21 pounds per square inch = 1.4479 bars
- 22 pounds per square inch = 1.5168 bars
- 23 pounds per square inch = 1.5858 bars
- 24 pounds per square inch = 1.6547 bars
- 25 pounds per square inch = 1.7237 bars
- 26 pounds per square inch = 1.7926 bars
- 27 pounds per square inch = 1.8616 bars
- 28 pounds per square inch = 1.9305 bars
- 29 pounds per square inch = 1.9995 bars
- 30 pounds per square inch = 2.0684 bars
- 31 pounds per square inch = 2.1374 bars
- 32 pounds per square inch = 2.2063 bars
- 33 pounds per square inch = 2.2753 bars
- 34 pounds per square inch = 2.3442 bars
- 35 pounds per square inch = 2.4132 bars
- 36 pounds per square inch = 2.4821 bars
- 37 pounds per square inch = 2.5511 bars
- 38 pounds per square inch = 2.62 bars
- 39 pounds per square inch = 2.689 bars
- 40 pounds per square inch = 2.7579 bars
- 41 pounds per square inch = 2.8269 bars
- 42 pounds per square inch = 2.8958 bars
- 43 pounds per square inch = 2.9647 bars
- 44 pounds per square inch = 3.0337 bars
- 45 pounds per square inch = 3.1026 bars
- 46 pounds per square inch = 3.1716 bars
- 47 pounds per square inch = 3.2405 bars
- 48 pounds per square inch = 3.3095 bars
- 49 pounds per square inch = 3.3784 bars
- 50 pounds per square inch = 3.4474 bars
- 51 pounds per square inch = 3.5163 bars
- 52 pounds per square inch = 3.5853 bars
- 53 pounds per square inch = 3.6542 bars
- 54 pounds per square inch = 3.7232 bars
- 55 pounds per square inch = 3.7921 bars
- 56 pounds per square inch = 3.8611 bars
- 57 pounds per square inch = 3.93 bars
- 58 pounds per square inch = 3.999 bars
- 59 pounds per square inch = 4.0679 bars
- 60 pounds per square inch = 4.1369 bars
- 61 pounds per square inch = 4.2058 bars
- 62 pounds per square inch = 4.2747 bars
- 63 pounds per square inch = 4.3437 bars
- 64 pounds per square inch = 4.4126 bars
- 65 pounds per square inch = 4.4816 bars
- 66 pounds per square inch = 4.5505 bars
- 67 pounds per square inch = 4.6195 bars
- 68 pounds per square inch = 4.6884 bars
- 69 pounds per square inch = 4.7574 bars
- 70 pounds per square inch = 4.8263 bars
- 71 pounds per square inch = 4.8953 bars
- 72 pounds per square inch = 4.9642 bars
- 73 pounds per square inch = 5.0332 bars
- 74 pounds per square inch = 5.1021 bars
- 75 pounds per square inch = 5.1711 bars
- 76 pounds per square inch = 5.24 bars
- 77 pounds per square inch = 5.309 bars
- 78 pounds per square inch = 5.3779 bars
- 79 pounds per square inch = 5.4469 bars
- 80 pounds per square inch = 5.5158 bars
- 81 pounds per square inch = 5.5848 bars
- 82 pounds per square inch = 5.6537 bars
- 83 pounds per square inch = 5.7226 bars
- 84 pounds per square inch = 5.7916 bars
- 85 pounds per square inch = 5.8605 bars
- 86 pounds per square inch = 5.9295 bars
- 87 pounds per square inch = 5.9984 bars
- 88 pounds per square inch = 6.0674 bars
- 89 pounds per square inch = 6.1363 bars
- 90 pounds per square inch = 6.2053 bars
- 91 pounds per square inch = 6.2742 bars
- 92 pounds per square inch = 6.3432 bars
- 93 pounds per square inch = 6.4121 bars
- 94 pounds per square inch = 6.4811 bars
- 95 pounds per square inch = 6.55 bars
- 96 pounds per square inch = 6.619 bars
- 97 pounds per square inch = 6.6879 bars
- 98 pounds per square inch = 6.7569 bars
- 99 pounds per square inch = 6.8258 bars
- 100 pounds per square inch = 6.8948 bars
Pound per square inch to Bar conversion table
The extended table below covers fractional and large values for quick reference.
| Pound per square inch (psi) | Bar (bar) |
|---|---|
| 0.01 psi | 0.00068948 bar |
| 0.05 psi | 0.003447 bar |
| 0.1 psi | 0.006895 bar |
| 0.2 psi | 0.01379 bar |
| 0.25 psi | 0.017237 bar |
| 0.3 psi | 0.020684 bar |
| 0.4 psi | 0.027579 bar |
| 0.5 psi | 0.034474 bar |
| 0.75 psi | 0.051711 bar |
| 1 psi | 0.068948 bar |
| 1.25 psi | 0.086184 bar |
| 1.5 psi | 0.103421 bar |
| 1.75 psi | 0.120658 bar |
| 2 psi | 0.137895 bar |
| 2.5 psi | 0.172369 bar |
| 3 psi | 0.206843 bar |
| 3.5 psi | 0.241317 bar |
| 4 psi | 0.27579 bar |
| 4.5 psi | 0.310264 bar |
| 5 psi | 0.344738 bar |
| 6 psi | 0.413685 bar |
| 7 psi | 0.482633 bar |
| 8 psi | 0.551581 bar |
| 9 psi | 0.620528 bar |
| 10 psi | 0.689476 bar |
| 11 psi | 0.758423 bar |
| 12 psi | 0.827371 bar |
| 13 psi | 0.896318 bar |
| 14 psi | 0.965266 bar |
| 15 psi | 1.0342 bar |
| 16 psi | 1.1032 bar |
| 17 psi | 1.1721 bar |
| 18 psi | 1.2411 bar |
| 19 psi | 1.31 bar |
| 20 psi | 1.379 bar |
| 22 psi | 1.5168 bar |
| 24 psi | 1.6547 bar |
| 25 psi | 1.7237 bar |
| 26 psi | 1.7926 bar |
| 28 psi | 1.9305 bar |
| 30 psi | 2.0684 bar |
| 32 psi | 2.2063 bar |
| 35 psi | 2.4132 bar |
| 40 psi | 2.7579 bar |
| 45 psi | 3.1026 bar |
| 50 psi | 3.4474 bar |
| 55 psi | 3.7921 bar |
| 60 psi | 4.1369 bar |
| 65 psi | 4.4816 bar |
| 70 psi | 4.8263 bar |
| 75 psi | 5.1711 bar |
| 80 psi | 5.5158 bar |
| 85 psi | 5.8605 bar |
| 90 psi | 6.2053 bar |
| 95 psi | 6.55 bar |
| 100 psi | 6.8948 bar |
| 110 psi | 7.5842 bar |
| 120 psi | 8.2737 bar |
| 125 psi | 8.6184 bar |
| 150 psi | 10.3421 bar |
| 175 psi | 12.0658 bar |
| 200 psi | 13.7895 bar |
| 250 psi | 17.2369 bar |
| 300 psi | 20.6843 bar |
| 350 psi | 24.1317 bar |
| 400 psi | 27.579 bar |
| 450 psi | 31.0264 bar |
| 500 psi | 34.4738 bar |
| 600 psi | 41.3685 bar |
| 700 psi | 48.2633 bar |
| 750 psi | 51.7107 bar |
| 800 psi | 55.1581 bar |
| 900 psi | 62.0528 bar |
| 1,000 psi | 68.9476 bar |
| 1,500 psi | 103.4214 bar |
| 2,000 psi | 137.8951 bar |
| 2,500 psi | 172.3689 bar |
| 5,000 psi | 344.7379 bar |
| 10,000 psi | 689.4757 bar |
Reverse table: bars to pounds per square inch
| Bar (bar) | Pound per square inch (psi) |
|---|---|
| 0.1 bar | 1.4504 psi |
| 0.25 bar | 3.6259 psi |
| 0.5 bar | 7.2519 psi |
| 1 bar | 14.5038 psi |
| 2 bar | 29.0075 psi |
| 3 bar | 43.5113 psi |
| 4 bar | 58.0151 psi |
| 5 bar | 72.5189 psi |
| 6 bar | 87.0226 psi |
| 7 bar | 101.5264 psi |
| 8 bar | 116.0302 psi |
| 9 bar | 130.534 psi |
| 10 bar | 145.0377 psi |
| 12 bar | 174.0453 psi |
| 15 bar | 217.5566 psi |
| 20 bar | 290.0755 psi |
| 25 bar | 362.5943 psi |
| 30 bar | 435.1132 psi |
| 40 bar | 580.151 psi |
| 50 bar | 725.1887 psi |
| 60 bar | 870.2264 psi |
| 75 bar | 1,087.78 psi |
| 100 bar | 1,450.38 psi |
| 150 bar | 2,175.57 psi |
| 200 bar | 2,900.75 psi |
| 250 bar | 3,625.94 psi |
| 500 bar | 7,251.89 psi |
| 750 bar | 10,877.83 psi |
| 1,000 bar | 14,503.77 psi |
| 5,000 bar | 72,518.87 psi |
Reverse lookup: bars in pounds per square inch
- 1 bar = 14.5038 pounds per square inch
- 2 bars = 29.0075 pounds per square inch
- 3 bars = 43.5113 pounds per square inch
- 4 bars = 58.0151 pounds per square inch
- 5 bars = 72.5189 pounds per square inch
- 6 bars = 87.0226 pounds per square inch
- 7 bars = 101.5264 pounds per square inch
- 8 bars = 116.0302 pounds per square inch
- 9 bars = 130.534 pounds per square inch
- 10 bars = 145.0377 pounds per square inch
- 11 bars = 159.5415 pounds per square inch
- 12 bars = 174.0453 pounds per square inch
- 13 bars = 188.5491 pounds per square inch
- 14 bars = 203.0528 pounds per square inch
- 15 bars = 217.5566 pounds per square inch
- 16 bars = 232.0604 pounds per square inch
- 17 bars = 246.5642 pounds per square inch
- 18 bars = 261.0679 pounds per square inch
- 19 bars = 275.5717 pounds per square inch
- 20 bars = 290.0755 pounds per square inch
- 21 bars = 304.5792 pounds per square inch
- 22 bars = 319.083 pounds per square inch
- 23 bars = 333.5868 pounds per square inch
- 24 bars = 348.0906 pounds per square inch
- 25 bars = 362.5943 pounds per square inch
- 26 bars = 377.0981 pounds per square inch
- 27 bars = 391.6019 pounds per square inch
- 28 bars = 406.1057 pounds per square inch
- 29 bars = 420.6094 pounds per square inch
- 30 bars = 435.1132 pounds per square inch
Common mistakes to avoid
Pressure errors usually come from absolute versus gauge readings — tire gauges show pressure above atmospheric, so "32 psi" is really 46.7 psi absolute — and from mixing bar with psi when inflating tires abroad; over-inflating by reading a bar target as psi is a common and dangerous mix-up.
Precision and rounding
The tables above round to a few decimal places for readability. When you need full precision — engineering drawings, scientific work, legal documents — use the exact factor 0.0689475729 and round only at the very end of your calculation. Rounding intermediate steps is the most common source of conversion drift, especially when several conversions are chained together.
Convert it instantly
Skip the arithmetic entirely: our free Pound per square inch to Bar converter computes any value as you type, and the Bar to Pound per square inch converter handles the reverse direction. For every other pressure unit, see the complete pressure conversion guide.
Frequently asked questions
How many bars are in one pound per square inch?
Exactly 0.068948 bars. This factor comes from the internationally agreed definitions of both units.
How do I convert bars back to pounds per square inch?
Divide by 0.06894757 — or equivalently multiply by 14.50377377, since one bar equals 14.5038 pounds per square inch.
Can I do this conversion in my head?
For estimates, round the factor: one pound per square inch ≈ 0.07 bars. That's usually close enough for shopping or travel; reach for the exact factor when precision matters.
What is 2.5 pounds per square inch in bars?
2.5 pounds per square inch equal 0.172369 bars. Multiply 2.5 by the factor 0.068948.
What is 500 pounds per square inch in bars?
500 pounds per square inch equal 34.4738 bars (500 × 0.068948).
Where does the conversion factor come from?
Both units are legally defined against the same SI base unit (the pascal), so the factor 0.0689475729 is a mathematical consequence of those definitions — it is exact, permanent, and the same everywhere in the world.
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