Bars to Pounds per square inch Converter
1 bar (bar) equals 14.503773773 pounds per square inch (psi).
Quick answer
To convert bar to psi, multiply by 14.5038. 1 bar ≈ 14.5 psi, and 2.5 bar ≈ 36 psi.
- 1 bar = 14.50377377 pounds per square inch
- 1 pound per square inch = 0.06894757293 bars
- Formula: psi = bar × 14.503773773
- Quick estimate: multiply by 15 and take off 3%: 2 bar → 30 − 1 = 29 psi (exact 29.0).
1 bar = 14.50377377 pounds per square inch
How to convert bars to pounds per square inch
psi = bar × 14.503773773
To convert bars to pounds per square inch, multiply the number of bars by 14.503773773.
Example: 42 bar to psi
- Start with the value in bars: 42 bar.
- Multiply by 14.503773773: 42 × 14.503773773 = 609.1584985.
- Result: 42 bars = 609.1584985 pounds per square inch.
Going the other way, 1 pound per square inch = 0.068947572932 bars, so to convert pounds per square inch back to bars you divide by the same number. See pounds per square inch to bars.
Where the conversion factor comes from
One bar is exactly 100,000 pascals, very close to average sea-level air pressure (1.01325 bar). One psi (pound-force per square inch) is 6,894.757 Pa, so 1 bar = 14.5038 psi and 1 psi = 0.0689476 bar. Tire and gauge pressures are usually "gauge pressure", measured above the surrounding atmosphere.
Mental math: bar to psi in your head
Multiply by 15 and take off about 3%: 9 bar → 135 − 4 = 131 psi (exact 130.5).
When you need to convert bars to pounds per square inch
- Car tire placards and European pumps showing bar.
- Espresso machines (9 bar brewing pressure).
- Water pressure, boilers and hydraulics.
Common mistakes
- Confusing bar with atmosphere (1 atm = 1.01325 bar) in precise work.
Everyday bars in pounds per square inch
| Example | Bars | Pounds per square inch |
|---|---|---|
| Household water pressure | 3 bar | 43.511 psi |
| Car tire (typical) | 2.3 bar | 33.359 psi |
| Espresso extraction | 9 bar | 130.53 psi |
| Air compressor tank | 8 bar | 116.03 psi |
| Scuba tank (full) | 200 bar | 2,900.8 psi |
Bars to pounds per square inch conversion table
| Bars (bar) | Pounds per square inch (psi) |
|---|---|
| 0.1 bar | 1.450377377 psi |
| 0.2 bar | 2.900754755 psi |
| 0.3 bar | 4.351132132 psi |
| 0.4 bar | 5.801509509 psi |
| 0.5 bar | 7.251886887 psi |
| 0.6 bar | 8.702264264 psi |
| 0.7 bar | 10.15264164 psi |
| 0.8 bar | 11.60301902 psi |
| 0.9 bar | 13.0533964 psi |
| 1 bar | 14.50377377 psi |
| 1.5 bar | 21.75566066 psi |
| 2 bar | 29.00754755 psi |
| 2.5 bar | 36.25943443 psi |
| 3 bar | 43.51132132 psi |
| 3.5 bar | 50.76320821 psi |
| 4 bar | 58.01509509 psi |
| 4.5 bar | 65.26698198 psi |
| 5 bar | 72.51886887 psi |
| 6 bar | 87.02264264 psi |
| 7 bar | 101.5264164 psi |
| 7.5 bar | 108.7783033 psi |
| 8 bar | 116.0301902 psi |
| 9 bar | 130.533964 psi |
| 10 bar | 145.0377377 psi |
| 11 bar | 159.5415115 psi |
| 12 bar | 174.0452853 psi |
| 13 bar | 188.549059 psi |
| 14 bar | 203.0528328 psi |
| 15 bar | 217.5566066 psi |
| 16 bar | 232.0603804 psi |
| 17 bar | 246.5641541 psi |
| 18 bar | 261.0679279 psi |
| 19 bar | 275.5717017 psi |
| 20 bar | 290.0754755 psi |
| 21 bar | 304.5792492 psi |
| 22 bar | 319.083023 psi |
| 23 bar | 333.5867968 psi |
| 24 bar | 348.0905706 psi |
| 25 bar | 362.5943443 psi |
| 26 bar | 377.0981181 psi |
More bar to psi values
- 27 bar
- 28 bar
- 29 bar
- 30 bar
- 31 bar
- 32 bar
- 33 bar
- 34 bar
- 35 bar
- 36 bar
- 37 bar
- 38 bar
- 39 bar
- 40 bar
- 41 bar
- 42 bar
- 43 bar
- 44 bar
- 45 bar
- 46 bar
- 47 bar
- 48 bar
- 49 bar
- 50 bar
- 51 bar
- 52 bar
- 53 bar
- 54 bar
- 55 bar
- 56 bar
- 57 bar
- 58 bar
- 59 bar
- 60 bar
- 61 bar
- 62 bar
- 63 bar
- 64 bar
- 65 bar
- 66 bar
- 67 bar
- 68 bar
- 69 bar
- 70 bar
- 71 bar
- 72 bar
- 73 bar
- 74 bar
- 75 bar
- 76 bar
- 77 bar
- 78 bar
- 79 bar
- 80 bar
- 81 bar
- 82 bar
- 83 bar
- 84 bar
- 85 bar
- 86 bar
- 87 bar
- 88 bar
- 89 bar
- 90 bar
- 91 bar
- 92 bar
- 93 bar
- 94 bar
- 95 bar
- 96 bar
- 97 bar
- 98 bar
- 99 bar
- 100 bar
- 110 bar
- 120 bar
- 130 bar
- 140 bar
- 150 bar
- 160 bar
- 170 bar
- 180 bar
- 190 bar
- 200 bar
- 210 bar
- 220 bar
- 230 bar
- 240 bar
- 250 bar
- 260 bar
- 270 bar
- 280 bar
- 290 bar
- 300 bar
- 310 bar
- 320 bar
- 330 bar
- 340 bar
- 350 bar
- 360 bar
- 370 bar
- 380 bar
- 390 bar
- 400 bar
- 410 bar
- 420 bar
- 430 bar
- 440 bar
- 450 bar
- 460 bar
- 470 bar
- 480 bar
- 490 bar
- 500 bar
- 600 bar
- 700 bar
- 800 bar
- 900 bar
- 1,000 bar
- 1,200 bar
- 1,500 bar
- 2,000 bar
- 2,500 bar
- 3,000 bar
- 4,000 bar
- 5,000 bar
- 10,000 bar
What is a bar?
The bar is a metric unit of pressure equal to 100,000 pascals, very close to atmospheric pressure at sea level (1 atm = 1.01325 bar).
What is a pound per square inch?
The pound per square inch (psi) is the unit of pressure used in the United States for tire pressures, air compressors, water systems and engineering.
Convert bars to other units
Convert other units to pounds per square inch
- Kilopascals to pounds per square inch
- Pascals to pounds per square inch
- Standard atmospheres to pounds per square inch
- Millimeters of mercury to pounds per square inch
- Hectopascals to pounds per square inch
- Megapascals to pounds per square inch
- Inches of mercury to pounds per square inch
- Millibars to pounds per square inch
- Centimeters of water to pounds per square inch
- Inches of water to pounds per square inch
- All pound per square inch conversions →
Frequently asked questions
How many pounds per square inch are in a bar?
One bar is 14.50377377 pounds per square inch.
How many bars are in a pound per square inch?
One pound per square inch is 0.06894757293 bars.
What is the formula to convert bars to pounds per square inch?
psi = bar × 14.503773773.
What is 2.2 bar in psi?
2.2 bar is 31.9 psi.