Convert Bar to Pound per square inch
1 bar = 14.50377 pound per square inch (psi). For example, 10 bar = 145.0377 pound per square inch and 100 bar = 1,450.377 pound per square inch. Type any value below to convert bar to pound per square inch both ways — it runs entirely in your browser.
Quick answer: Bar to Pound per square inch
1 Bar = 14.50377 Pound per square inch (bar → psi). To convert bar to pound per square inch, multiply by 14.50377. To convert pound per square inch to bar, multiply by 0.06894757. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common bar-to-pound per square inch questions.
How to convert Bar to Pound per square inch
To convert bar to pound per square inch, multiply the number of bar by the conversion factor 14.50377, because 1 bar = 14.50377 psi. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 psi = 0.06894757 bar, so you divide by 14.50377 (or multiply by 0.06894757) to turn pound per square inch back into bar.
psi = bar × 14.50377 ·
bar = psi × 0.06894757
- Write down the value you want to convert, in bar.
- Multiply it by 14.50377.
- The result is the same area/length/quantity expressed in pound per square inch.
Bar to Pound per square inch — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 bar is 72.51887 pound per square inch because 5 bar × 14.50377 = 72.51887 psi.
| Bar | Calculation | Pound per square inch |
|---|---|---|
| 1 bar | 1 bar × 14.50377 = 14.50377 psi | 14.50377 psi |
| 2 bar | 2 bar × 14.50377 = 29.00755 psi | 29.00755 psi |
| 3 bar | 3 bar × 14.50377 = 43.51132 psi | 43.51132 psi |
| 5 bar | 5 bar × 14.50377 = 72.51887 psi | 72.51887 psi |
| 7 bar | 7 bar × 14.50377 = 101.5264 psi | 101.5264 psi |
| 10 bar | 10 bar × 14.50377 = 145.0377 psi | 145.0377 psi |
| 12 bar | 12 bar × 14.50377 = 174.0453 psi | 174.0453 psi |
| 15 bar | 15 bar × 14.50377 = 217.5566 psi | 217.5566 psi |
| 20 bar | 20 bar × 14.50377 = 290.0755 psi | 290.0755 psi |
| 25 bar | 25 bar × 14.50377 = 362.5943 psi | 362.5943 psi |
| 50 bar | 50 bar × 14.50377 = 725.1887 psi | 725.1887 psi |
| 100 bar | 100 bar × 14.50377 = 1,450.377 psi | 1,450.377 psi |
Common Bar to Pound per square inch conversions
These are the bar-to-pound per square inch values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 bar = 14.50377 pound per square inch
- 2 bar = 29.00755 pound per square inch
- 2.5 bar = 36.25943 pound per square inch
- 3 bar = 43.51132 pound per square inch
- 4 bar = 58.0151 pound per square inch
- 5 bar = 72.51887 pound per square inch
- 6 bar = 87.02264 pound per square inch
- 7 bar = 101.5264 pound per square inch
- 8 bar = 116.0302 pound per square inch
- 9 bar = 130.534 pound per square inch
- 10 bar = 145.0377 pound per square inch
- 12 bar = 174.0453 pound per square inch
- 15 bar = 217.5566 pound per square inch
- 20 bar = 290.0755 pound per square inch
- 25 bar = 362.5943 pound per square inch
- 30 bar = 435.1132 pound per square inch
- 50 bar = 725.1887 pound per square inch
- 75 bar = 1,087.783 pound per square inch
- 100 bar = 1,450.377 pound per square inch
- 200 bar = 2,900.755 pound per square inch
- 500 bar = 7,251.887 pound per square inch
- 1000 bar = 14,503.77 pound per square inch
Bar to Pound per square inch conversion chart (both directions)
The chart below converts bar to pound per square inch and pound per square inch to bar side by side, so it works whichever way you need. 1 bar = 14.50377 pound per square inch, and 1 pound per square inch = 0.06894757 bar.
| Bar → Pound per square inch | Pound per square inch → Bar |
|---|---|
| 0.25 bar = 3.625943 psi | 0.25 psi = 0.01723689 bar |
| 0.5 bar = 7.251887 psi | 0.5 psi = 0.03447379 bar |
| 1 bar = 14.50377 psi | 1 psi = 0.06894757 bar |
| 2 bar = 29.00755 psi | 2 psi = 0.1378951 bar |
| 3 bar = 43.51132 psi | 3 psi = 0.2068427 bar |
| 4 bar = 58.0151 psi | 4 psi = 0.2757903 bar |
| 5 bar = 72.51887 psi | 5 psi = 0.3447379 bar |
| 6 bar = 87.02264 psi | 6 psi = 0.4136854 bar |
| 7 bar = 101.5264 psi | 7 psi = 0.482633 bar |
| 8 bar = 116.0302 psi | 8 psi = 0.5515806 bar |
| 9 bar = 130.534 psi | 9 psi = 0.6205282 bar |
| 10 bar = 145.0377 psi | 10 psi = 0.6894757 bar |
| 12 bar = 174.0453 psi | 12 psi = 0.8273709 bar |
| 15 bar = 217.5566 psi | 15 psi = 1.034214 bar |
| 20 bar = 290.0755 psi | 20 psi = 1.378951 bar |
| 25 bar = 362.5943 psi | 25 psi = 1.723689 bar |
| 30 bar = 435.1132 psi | 30 psi = 2.068427 bar |
| 40 bar = 580.151 psi | 40 psi = 2.757903 bar |
| 50 bar = 725.1887 psi | 50 psi = 3.447379 bar |
| 75 bar = 1,087.783 psi | 75 psi = 5.171068 bar |
| 100 bar = 1,450.377 psi | 100 psi = 6.894757 bar |
| 150 bar = 2,175.566 psi | 150 psi = 10.34214 bar |
| 200 bar = 2,900.755 psi | 200 psi = 13.78951 bar |
| 250 bar = 3,625.943 psi | 250 psi = 17.23689 bar |
| 500 bar = 7,251.887 psi | 500 psi = 34.47379 bar |
| 1000 bar = 14,503.77 psi | 1000 psi = 68.94757 bar |
Bar vs Pound per square inch: which is bigger?
A bar is the larger unit: one bar equals 14.50377 pound per square inchs. Put another way, you need 14.50377 pound per square inchs to make a single bar.
What is a Bar? History, origin and usage
The bar takes its name from the Greek báros, meaning weight. It was deliberately defined as exactly 100,000 pascals, a round number chosen to sit very close to average air pressure at sea level, so that a pressure "in bars" reads roughly as "how many atmospheres". It is not an SI unit, but the International Bureau of Weights and Measures lists it among the units accepted for use alongside SI.
Bars are the everyday pressure unit across most of Europe and much of Asia: tyre inflators, bicycle pumps, espresso machines, diving cylinders, pressure washers and boiler gauges. An espresso machine is conventionally built around 9 bar of brewing pressure.
A bar is close to, but not the same as, an atmosphere — one atmosphere is 1.01325 bar exactly, a difference of about 1.3%. Diving uses this closeness deliberately: seawater adds roughly one bar of pressure for every ten metres of depth.
What is a Pound per square inch? History, origin and usage
Pounds per square inch grew directly out of the steam age: boiler safety valves were rated by how many pounds of weight it took to hold them shut over a known area, and the unit survived into every later technology that Britain and the United States industrialised. It never went through a formal international definition of its own — instead it became exact in 1959, when the yard-and-pound agreement fixed the pound and the inch exactly, and again through the fixing of standard gravity, which pins down what a "pound of force" means.
Psi is the standard pressure unit in the United States and remains widely understood in Britain, India and elsewhere: tyre pressures, air compressors, pressure washers, water mains, hydraulic lines and scuba tanks. Car tyres are commonly inflated to around 30 to 35 psi.
Psi is exactly defined but its value in pascals is a decimal that repeats forever, so any written figure is necessarily rounded somewhere. Gauges usually read gauge pressure — the amount above surrounding air — which is why a flat tyre reads zero rather than about 14.7.
Convert 1 Bar to other units
It can help to see a bar next to the other units it is commonly compared with. One bar (bar) is equal to:
| 1 Bar equals | Unit |
|---|---|
| 100,000 Pa | Pascal |
| 1,000 hPa | Hectopascal |
| 100 kPa | Kilopascal |
| 0.1 MPa | Megapascal |
| 1,000 mbar | Millibar |
| 0.9869233 atm | Standard atmosphere |
| 750.0617 Torr | Torr |
| 750.0616 mmHg | Millimetre of mercury |
| 29.52998 inHg | Inch of mercury |
| 10,197.16 mmH₂O | Millimetre of water |
| 401.4631 inH₂O | Inch of water |
| 14.50377 psi | Pound per square inch |
| 1.019716 kgf/cm² | Kilogram-force per square centimetre |
Convert 1 Pound per square inch to other units
One pound per square inch (psi) is equal to:
| 1 Pound per square inch equals | Unit |
|---|---|
| 6,894.757 Pa | Pascal |
| 68.94757 hPa | Hectopascal |
| 6.894757 kPa | Kilopascal |
| 0.006894757 MPa | Megapascal |
| 68.94757 mbar | Millibar |
| 0.06894757 bar | Bar |
| 0.06804596 atm | Standard atmosphere |
| 51.71493 Torr | Torr |
| 51.71493 mmHg | Millimetre of mercury |
| 2.036021 inHg | Inch of mercury |
| 703.0696 mmH₂O | Millimetre of water |
| 27.6799 inH₂O | Inch of water |
| 0.07030696 kgf/cm² | Kilogram-force per square centimetre |
Tips for converting Bar to Pound per square inch
- To go from bar to pound per square inch, multiply by 14.50377; to go back, divide by 14.50377 (or multiply by 0.06894757).
- For a quick mental estimate, remember that 1 bar ≈ 14.50377 pound per square inch, so 10 bar ≈ 145.0377 pound per square inch.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Bar to Pound per square inch converter
Type a number into the Bar field and the equivalent in Pound per square inch appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Pound per square inch field to convert the other way (pound per square inch to bar). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 bar = 14.50377 psi), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for bar-to-pound per square inch conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary pressure units. A psi is one pound of force over one square inch, and the 1959 international yard-and-pound agreement fixes the pound at exactly 0.453 592 37 kilogram and the inch at exactly 0.0254 metre, while standard gravity is fixed at exactly 9.806 65 m/s² — so psi, inches of mercury and inches of water are defined exactly rather than measured.
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
Pressure factors here come from fixed definitions, anchored to the pascal: a bar is exactly 100,000 Pa, one atmosphere is exactly 101,325 Pa, a torr is exactly a 760th of an atmosphere, and psi is built from the exact pound and the exact inch. Two of them — psi and the torr — work out to decimals that repeat forever, so where a number is shown rounded it is marked, not quietly trimmed.
Frequently asked questions
- How many pound per square inch are in 1 bar?
- 1 bar = 14.50377 pound per square inch (psi). To convert any number of bar to pound per square inch, multiply by 14.50377.
- How do I convert bar to pound per square inch?
- Multiply the number of bar by 14.50377. For example, 10 bar = 10 × 14.50377 = 145.0377 pound per square inch, and 25 bar = 362.5943 pound per square inch.
- How many bar are in 1 pound per square inch?
- 1 pound per square inch = 0.06894757 bar. So to convert pound per square inch back to bar, multiply by 0.06894757.
- What is the formula to convert bar to pound per square inch?
- pound per square inch = bar × 14.50377. The reverse formula is bar = pound per square inch × 0.06894757.
- How much is 100 bar in pound per square inch?
- 100 bar = 1,450.377 pound per square inch. (And 1000 bar = 14,503.77 pound per square inch.)
- Which is bigger, a bar or a pound per square inch?
- A bar is larger: 1 bar = 14.50377 pound per square inch.
- Is this bar to pound per square inch converter accurate?
- Yes — every value is computed from the exact 14.50377 psi per bar factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert pound per square inch to bar too?
- Yes. The converter works both ways — enter a value in either field. 1 pound per square inch = 0.06894757 bar.