bar to psi Converter (Tire Pressure Chart)
Convert bar to pounds per square inch for European tire placards, espresso machines and air tools. 1 bar = 14.5038 psi: 2.2 bar is 31.9 psi and 2.5 bar is 36.3 psi.
Real-World Benchmarks
Multi-Unit Conversion Matrix
| Group | Measurement | Symbol | Equivalent Value |
|---|---|---|---|
| SI & Metric | Pascal | Pa | 250,000 |
| SI & Metric | Hectopascal | hPa | 2,500 |
| SI & Metric | Kilopascal | kPa | 250 |
| SI & Metric | Megapascal | MPa | 0.25 |
| SI & Metric | Bar | bar | 2.5 |
| SI & Metric | Millibar | mbar | 2,500 |
| SI & Metric | Kilogram-force per cm² | kgf/cm² | 2.5493 |
| Imperial & US Customary | Pound per Square Inch | psi | 36.2594 |
| Imperial & US Customary | Kilopound per Square Inch | ksi | 0.0363 |
| Atmospheric & Manometric | Standard Atmosphere | atm | 2.4673 |
| Atmospheric & Manometric | Torr | Torr | 1,875.1542 |
| Atmospheric & Manometric | Millimeter of Mercury | mmHg | 1,875.1539 |
| Atmospheric & Manometric | Inch of Mercury | inHg | 73.825 |
| Atmospheric & Manometric | Inch of Water | inH₂O | 1,003.6577 |
Step-by-Step Mathematical Explanation
- Step 1: Convert 2.5 bar to the base unit (Pa): 2.5 × 100,000 = 250,000 Pa.
- Step 2: Convert base pascals to pounds per square inch: 250,000 ÷ 6,894.75729317 = 36.259434 psi.
- Direct factor: 1 bar = 14.50377377 psi.
Essential Conversion Factors
Bar: European tire, espresso and diving pressure
bar to psi formula
Direct Answer: 1 bar = 14.503774 psi, so multiply by 14.503774: psi = bar × 14.503774. Going back: bar = psi × 0.068947573.
How to convert bars to pounds per square inch
One bar is exactly 100,000 pascals; one psi is 6,894.757 Pa. Multiplying bar by 14.5038 gives psi. Car tire placards in Europe and Asia list bar (sometimes kPa: 1 bar = 100 kPa), while US gauges and pumps read psi.
1. bar → psi
Multiply the number of bars by the conversion factor:
Example: 2.5 bar × 14.503774 = 36.26 psi.
2. psi → bar
To go back, divide by the same factor, or multiply by its reciprocal, 0.068947573:
Example: 36.26 psi ÷ 14.503774 = 2.5 bar.
Mental math: multiply by 14.5
Multiply by 15, then take off about 3%. Multiplying by 14.5 is almost exact:
2.4 bar: 2.4 × 14.5 = 34.8 psi (exact: 34.81 psi).
1 bar in other pressure units
| Unit | 1 bar equals | Typical use |
|---|---|---|
| Pascal | 100,000 Pa | SI unit of pressure (1 N/m²) |
| Hectopascal | 1,000 hPa | Weather maps and barometers (= 1 mbar) |
| Kilopascal | 100 kPa | Tire pressure in Canada, Australia and Asia |
| Megapascal | 0.1 MPa | Material strength and hydraulics (= 1 N/mm²) |
| Millibar | 1,000 mbar | Meteorology and gas appliances |
| Kilogram-force per cm² | 1.0197162 kgf/cm² | Technical atmosphere (at), older gauges |
| Pound per Square Inch | 14.503774 psi | US tire, air compressor and hydraulic pressure |
| Kilopound per Square Inch | 0.014503774 ksi | Steel and material yield strength (1,000 psi) |
| Standard Atmosphere | 0.98692327 atm | Mean sea-level air pressure |
| Torr | 750.06168 Torr | Vacuum systems (1/760 atm) |
| Millimeter of Mercury | 750.06158 mmHg | Blood pressure readings |
| Inch of Mercury | 29.52998 inHg | US aviation altimeters and weather |
| Inch of Water | 401.46308 inH₂O | HVAC duct and low gas pressures |
bar to psi chart
| bar | psi |
|---|---|
| 0.5 | 7.25 |
| 1 | 14.5 |
| 1.5 | 21.76 |
| 1.8 | 26.11 |
| 2 | 29.01 |
| 2.1 | 30.46 |
| 2.2 | 31.91 |
| 2.3 | 33.36 |
| 2.4 | 34.81 |
| 2.5 | 36.26 |
| 2.6 | 37.71 |
| 2.8 | 40.61 |
| 3 | 43.51 |
| 3.5 | 50.76 |
| 4 | 58.02 |
| 5 | 72.52 |
| 6 | 87.02 |
| 7 | 101.53 |
| 8 | 116.03 |
| 9 | 130.53 |
| 10 | 145.04 |
| 12 | 174.05 |
| 15 | 217.56 |
| 20 | 290.08 |
| 50 | 725.19 |
| 100 | 1,450.38 |
| 200 | 2,900.75 |
| 300 | 4,351.13 |
psi to bar chart
| psi | bar |
|---|---|
| 1 | 0.069 |
| 5 | 0.345 |
| 10 | 0.689 |
| 14.5 | 1 |
| 15 | 1.034 |
| 20 | 1.379 |
| 25 | 1.724 |
| 28 | 1.931 |
| 30 | 2.068 |
| 32 | 2.206 |
| 33 | 2.275 |
| 34 | 2.344 |
| 35 | 2.413 |
| 36 | 2.482 |
| 38 | 2.62 |
| 40 | 2.758 |
| 42 | 2.896 |
| 44 | 3.034 |
| 45 | 3.103 |
| 50 | 3.447 |
| 60 | 4.137 |
| 65 | 4.482 |
| 80 | 5.516 |
| 90 | 6.205 |
| 100 | 6.895 |
| 120 | 8.274 |
| 150 | 10.342 |
| 200 | 13.79 |
| 300 | 20.684 |
| 1,000 | 68.948 |
| 3,000 | 206.843 |
Frequently Asked Questions
What is 2.2 bar in psi?
2.2 bar is 31.91 psi (2.2 × 14.503774).
What is 10 bar in psi?
10 bar is 145.04 psi (10 × 14.503774).
How many psi is 9 bar on an espresso machine?
9 bar × 14.5038 = 130.5 psi, the classic extraction pressure for espresso.
How many kPa is 1 bar?
1 bar = 100 kPa exactly, so 2.5 bar = 250 kPa = 36.26 psi.