Convert Pound per square inch to Bar
1 pound per square inch = 0.06894757 bar (bar). For example, 10 pound per square inch = 0.6894757 bar and 100 pound per square inch = 6.894757 bar. Type any value below to convert pound per square inch to bar both ways — it runs entirely in your browser.
Quick answer: Pound per square inch to Bar
1 Pound per square inch = 0.06894757 Bar (psi → bar). To convert pound per square inch to bar, multiply by 0.06894757. To convert bar to pound per square inch, multiply by 14.50377. 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 pound per square inch-to-bar questions.
How to convert Pound per square inch to Bar
To convert pound per square inch to bar, multiply the number of pound per square inch by the conversion factor 0.06894757, because 1 psi = 0.06894757 bar. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 bar = 14.50377 psi, so you divide by 0.06894757 (or multiply by 14.50377) to turn bar back into pound per square inch.
bar = psi × 0.06894757 ·
psi = bar × 14.50377
- Write down the value you want to convert, in pound per square inch.
- Multiply it by 0.06894757.
- The result is the same area/length/quantity expressed in bar.
Pound per square inch to Bar — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 pound per square inch is 0.3447379 bar because 5 psi × 0.06894757 = 0.3447379 bar.
| Pound per square inch | Calculation | Bar |
|---|---|---|
| 1 psi | 1 psi × 0.06894757 = 0.06894757 bar | 0.06894757 bar |
| 2 psi | 2 psi × 0.06894757 = 0.1378951 bar | 0.1378951 bar |
| 3 psi | 3 psi × 0.06894757 = 0.2068427 bar | 0.2068427 bar |
| 5 psi | 5 psi × 0.06894757 = 0.3447379 bar | 0.3447379 bar |
| 7 psi | 7 psi × 0.06894757 = 0.482633 bar | 0.482633 bar |
| 10 psi | 10 psi × 0.06894757 = 0.6894757 bar | 0.6894757 bar |
| 12 psi | 12 psi × 0.06894757 = 0.8273709 bar | 0.8273709 bar |
| 15 psi | 15 psi × 0.06894757 = 1.034214 bar | 1.034214 bar |
| 20 psi | 20 psi × 0.06894757 = 1.378951 bar | 1.378951 bar |
| 25 psi | 25 psi × 0.06894757 = 1.723689 bar | 1.723689 bar |
| 50 psi | 50 psi × 0.06894757 = 3.447379 bar | 3.447379 bar |
| 100 psi | 100 psi × 0.06894757 = 6.894757 bar | 6.894757 bar |
Common Pound per square inch to Bar conversions
These are the pound per square inch-to-bar values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 pound per square inch = 0.06894757 bar
- 2 pound per square inch = 0.1378951 bar
- 2.5 pound per square inch = 0.1723689 bar
- 3 pound per square inch = 0.2068427 bar
- 4 pound per square inch = 0.2757903 bar
- 5 pound per square inch = 0.3447379 bar
- 6 pound per square inch = 0.4136854 bar
- 7 pound per square inch = 0.482633 bar
- 8 pound per square inch = 0.5515806 bar
- 9 pound per square inch = 0.6205282 bar
- 10 pound per square inch = 0.6894757 bar
- 12 pound per square inch = 0.8273709 bar
- 15 pound per square inch = 1.034214 bar
- 20 pound per square inch = 1.378951 bar
- 25 pound per square inch = 1.723689 bar
- 30 pound per square inch = 2.068427 bar
- 50 pound per square inch = 3.447379 bar
- 75 pound per square inch = 5.171068 bar
- 100 pound per square inch = 6.894757 bar
- 200 pound per square inch = 13.78951 bar
- 500 pound per square inch = 34.47379 bar
- 1000 pound per square inch = 68.94757 bar
Pound per square inch to Bar conversion chart (both directions)
The chart below converts pound per square inch to bar and bar to pound per square inch side by side, so it works whichever way you need. 1 pound per square inch = 0.06894757 bar, and 1 bar = 14.50377 pound per square inch.
| Pound per square inch → Bar | Bar → Pound per square inch |
|---|---|
| 0.25 psi = 0.01723689 bar | 0.25 bar = 3.625943 psi |
| 0.5 psi = 0.03447379 bar | 0.5 bar = 7.251887 psi |
| 1 psi = 0.06894757 bar | 1 bar = 14.50377 psi |
| 2 psi = 0.1378951 bar | 2 bar = 29.00755 psi |
| 3 psi = 0.2068427 bar | 3 bar = 43.51132 psi |
| 4 psi = 0.2757903 bar | 4 bar = 58.0151 psi |
| 5 psi = 0.3447379 bar | 5 bar = 72.51887 psi |
| 6 psi = 0.4136854 bar | 6 bar = 87.02264 psi |
| 7 psi = 0.482633 bar | 7 bar = 101.5264 psi |
| 8 psi = 0.5515806 bar | 8 bar = 116.0302 psi |
| 9 psi = 0.6205282 bar | 9 bar = 130.534 psi |
| 10 psi = 0.6894757 bar | 10 bar = 145.0377 psi |
| 12 psi = 0.8273709 bar | 12 bar = 174.0453 psi |
| 15 psi = 1.034214 bar | 15 bar = 217.5566 psi |
| 20 psi = 1.378951 bar | 20 bar = 290.0755 psi |
| 25 psi = 1.723689 bar | 25 bar = 362.5943 psi |
| 30 psi = 2.068427 bar | 30 bar = 435.1132 psi |
| 40 psi = 2.757903 bar | 40 bar = 580.151 psi |
| 50 psi = 3.447379 bar | 50 bar = 725.1887 psi |
| 75 psi = 5.171068 bar | 75 bar = 1,087.783 psi |
| 100 psi = 6.894757 bar | 100 bar = 1,450.377 psi |
| 150 psi = 10.34214 bar | 150 bar = 2,175.566 psi |
| 200 psi = 13.78951 bar | 200 bar = 2,900.755 psi |
| 250 psi = 17.23689 bar | 250 bar = 3,625.943 psi |
| 500 psi = 34.47379 bar | 500 bar = 7,251.887 psi |
| 1000 psi = 68.94757 bar | 1000 bar = 14,503.77 psi |
Pound per square inch vs Bar: 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 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.
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.
Convert 1 Pound per square inch to other units
It can help to see a pound per square inch next to the other units it is commonly compared with. 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 |
Convert 1 Bar to other units
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 |
Tips for converting Pound per square inch to Bar
- To go from pound per square inch to bar, multiply by 0.06894757; to go back, divide by 0.06894757 (or multiply by 14.50377).
- For a quick mental estimate, remember that 1 pound per square inch ≈ 0.06894757 bar, so 10 pound per square inch ≈ 0.6894757 bar.
- 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 Pound per square inch to Bar converter
Type a number into the Pound per square inch field and the equivalent in Bar 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 Bar field to convert the other way (bar to pound per square inch). 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 psi = 0.06894757 bar), 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 pound per square inch-to-bar 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 bar are in 1 pound per square inch?
- 1 pound per square inch = 0.06894757 bar (bar). To convert any number of pound per square inch to bar, multiply by 0.06894757.
- How do I convert pound per square inch to bar?
- Multiply the number of pound per square inch by 0.06894757. For example, 10 pound per square inch = 10 × 0.06894757 = 0.6894757 bar, and 25 pound per square inch = 1.723689 bar.
- How many pound per square inch are in 1 bar?
- 1 bar = 14.50377 pound per square inch. So to convert bar back to pound per square inch, multiply by 14.50377.
- What is the formula to convert pound per square inch to bar?
- bar = pound per square inch × 0.06894757. The reverse formula is pound per square inch = bar × 14.50377.
- How much is 100 pound per square inch in bar?
- 100 pound per square inch = 6.894757 bar. (And 1000 pound per square inch = 68.94757 bar.)
- Which is bigger, a pound per square inch or a bar?
- A bar is larger: 1 bar = 14.50377 pound per square inch.
- Is this pound per square inch to bar converter accurate?
- Yes — every value is computed from the exact 0.06894757 bar per psi factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert bar to pound per square inch too?
- Yes. The converter works both ways — enter a value in either field. 1 bar = 14.50377 pound per square inch.