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Equivalent pressure value
Accurate pressure conversion tool for psi, bar, kPa, Pa, mbar, atm, and kgf/cm²
Convert PSI to bar instantly with precise calculations. Includes bidirectional conversion and a complete pressure unit breakdown for 2026.
Professional pressure conversion for tyre inflation, hydraulics, compressors, gas lines, industrial equipment, and engineering applications
Convert PSI to bar with full precision using the exact conversion factor of 1 psi = 0.0689476 bar. Our tool delivers reliable results for any pressure value — from tyre pressures and bicycle pumps at 30–120 psi, to industrial hydraulic systems, air compressors, gas cylinder ratings, and pressure vessel specifications across all engineering disciplines worldwide.
Switch seamlessly between PSI to bar and bar to PSI conversion modes. Get instant results in multiple pressure units including kilopascals, pascals, millibar, atmospheres, and kg/cm² — all from a single input value without any additional calculation steps. The complete multi-unit breakdown is displayed with every result for full professional reference.
Essential for automotive technicians, mechanical engineers, HVAC professionals, plumbers, and anyone working across US and international equipment standards. PSI dominates in American automotive, industrial, and consumer products, while bar is the standard in European and international engineering — making psi to bar conversion a daily necessity for global technical work.
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PSI stands for pounds per square inch (lb/in²) — the pressure exerted by one pound-force over one square inch of area. It is the dominant pressure unit in the United States for everything from tyre inflation and air compressors to hydraulic systems and gas pipelines. The bar is a metric unit defined as exactly 100,000 pascals (100 kPa). The exact conversion is 1 psi = 0.0689476 bar, derived from the definitions: 1 lbf = 4.44822 N and 1 in² = 6.4516 × 10⁻⁴ m², giving 1 psi = 4.44822 ÷ 0.00064516 = 6,894.76 Pa = 0.0689476 bar.
In reverse, 1 bar = 14.5038 psi. Standard atmospheric pressure is 14.696 psi = 1.01325 bar. In tyre pressure terms, a common car tyre inflation of 32 psi equals 2.206 bar — and most European vehicles specify tyre pressures in bar on the door placard, while American vehicles use psi. This everyday difference makes the PSI to bar converter one of the most practically used pressure conversion tools across automotive, HVAC, plumbing, and industrial engineering sectors globally.
Example: 30 psi × 0.0689476 = 2.068 bar | 3.5 bar × 14.5038 = 50.763 psi
1 psi = 0.0689476 bar = 6,894.76 Pa. Standard atmosphere = 14.696 psi = 1.01325 bar. A typical car tyre at 32 psi = 2.207 bar. A bicycle tyre at 100 psi = 6.895 bar.
Use this reference table to quickly look up common psi to bar conversions covering tyre pressures, compressor ratings, and industrial applications. All values use the exact factor: 1 psi = 0.0689476 bar.
| PSI (lb/in²) | Bar | Kilopascal (kPa) | Pascal (Pa) | Atmosphere (atm) | Millibar (mbar) |
|---|---|---|---|---|---|
| 1 psi | 0.06895 bar | 6.895 kPa | 6,894.76 Pa | 0.06805 atm | 68.948 mbar |
| 5 psi | 0.34474 bar | 34.474 kPa | 34,473.8 Pa | 0.34023 atm | 344.738 mbar |
| 10 psi | 0.68948 bar | 68.948 kPa | 68,947.6 Pa | 0.68046 atm | 689.476 mbar |
| 14.696 psi | 1.01325 bar | 101.325 kPa | 101,325 Pa | 1 atm | 1,013.25 mbar |
| 20 psi | 1.37895 bar | 137.895 kPa | 137,895 Pa | 1.36092 atm | 1,378.95 mbar |
| 25 psi | 1.72369 bar | 172.369 kPa | 172,369 Pa | 1.70115 atm | 1,723.69 mbar |
| 30 psi | 2.06843 bar | 206.843 kPa | 206,843 Pa | 2.04138 atm | 2,068.43 mbar |
| 35 psi | 2.41317 bar | 241.317 kPa | 241,317 Pa | 2.38161 atm | 2,413.17 mbar |
| 40 psi | 2.75790 bar | 275.790 kPa | 275,790 Pa | 2.72184 atm | 2,757.90 mbar |
| 50 psi | 3.44738 bar | 344.738 kPa | 344,738 Pa | 3.40230 atm | 3,447.38 mbar |
| 100 psi | 6.89476 bar | 689.476 kPa | 689,476 Pa | 6.80460 atm | 6,894.76 mbar |
| 150 psi | 10.3421 bar | 1,034.21 kPa | 1,034,213 Pa | 10.2069 atm | 10,342.1 mbar |
| 200 psi | 13.7895 bar | 1,378.95 kPa | 1,378,951 Pa | 13.6092 atm | 13,789.5 mbar |
| 500 psi | 34.4738 bar | 3,447.38 kPa | 3,447,379 Pa | 34.0230 atm | 34,473.8 mbar |
PSI (pounds per square inch) is the pressure resulting from one pound-force applied to an area of one square inch. It is part of the US customary system and is the dominant pressure unit in America for automotive, industrial, plumbing, and consumer applications. Standard atmospheric pressure at sea level is 14.696 psi. Tyre pressures in the US are specified in psi, as are most American air compressors, pressure washers, and hydraulic system ratings.
The bar is a metric unit of pressure equal to exactly 100,000 pascals (100 kPa). Although not an SI unit, it is accepted for use with the SI and is widely used in European and international engineering, science, and industry. Standard atmospheric pressure is 1.01325 bar. The bar is the preferred unit for tyre pressures, boiler pressures, hydraulic specifications, and industrial process pressures across Europe, Asia, and most of the world outside North America.
Car tyre pressures typically range from 28–36 psi (1.93–2.48 bar) for passenger vehicles. SUVs and trucks may require 35–45 psi (2.41–3.10 bar). Bicycle tyres range from 80–130 psi (5.5–9.0 bar) for road bikes and 30–50 psi (2.1–3.4 bar) for mountain bikes. US vehicles specify tyre pressure in psi on the door placard, while European vehicles use bar. Incorrect tyre pressure affects fuel economy, handling, and tyre wear — making accurate psi/bar conversion safety-critical.
Air compressors used for pneumatic tools, spray painting, and inflation are rated in psi in the US and bar in Europe. A typical portable compressor delivers 90–150 psi (6.2–10.3 bar). Pneumatic nail guns require 70–120 psi (4.8–8.3 bar). HVAC systems typically operate at 100–600 psi (6.9–41.4 bar) on the refrigerant side. When importing or using European compressors and tools in the US — or vice versa — accurate psi to bar conversion is essential to avoid overpressure and equipment damage.
Residential water supply pressure is typically 40–80 psi (2.76–5.52 bar) in US homes, with 60 psi (4.14 bar) being the common working pressure. Pressure relief valves on water heaters are typically rated at 150 psi (10.34 bar). In Europe, mains water pressure is commonly expressed in bar — usually 3–5 bar (43.5–72.5 psi). Plumbers and building engineers working with international fixtures, valves, or specifications need to convert between psi and bar regularly.
Industrial hydraulic systems operate at pressures from 1,000 to 5,000 psi (69 to 345 bar). Heavy mobile equipment such as excavators and cranes uses hydraulic pressures up to 5,000–7,500 psi (345–517 bar). Hydraulic press specifications, injection moulding machines, and industrial actuators may be rated in either psi or bar depending on the country of manufacture. Converting between these units correctly is critical for system design, component selection, safety valve ratings, and maintenance procedures.
To convert psi to bar, multiply by 0.0689476. A quick mental shortcut: divide psi by 14.5 for a close approximation (error <0.04%). For example, 30 psi ÷ 14.5 ≈ 2.07 bar (exact: 2.068 bar). For the reverse — bar to psi — multiply by 14.5038, or use the approximation × 14.5. For example, 2.5 bar × 14.5 ≈ 36.25 psi (exact: 36.26 psi). This mental shortcut is accurate enough for tyre inflation, compressor settings, and general engineering estimates without a calculator.
There are two types of PSI measurement: PSIg (gauge pressure) — measured relative to atmospheric pressure (so 0 PSIg = atmospheric pressure), and PSIa (absolute pressure) — measured relative to a perfect vacuum (0 PSIa = complete vacuum). Tyre pressures and most industrial applications use gauge pressure. To convert: PSIa = PSIg + 14.696. Similarly, bar gauge (barg) and bar absolute (bara) exist: bara = barg + 1.01325. Always check whether a pressure specification is gauge or absolute before converting, especially in vacuum, HVAC, and precision instrumentation work.
Do not confuse bar (100,000 Pa), millibar (100 Pa = 0.001 bar), and microbar (0.1 Pa). A tyre pressure of 2.5 bar is very different from 2.5 millibar (which is barely above vacuum). In meteorology, atmospheric pressure is expressed in millibar (≈1,013 mbar) or hectopascals (hPa), which numerically equals mbar. In engineering, bar is the standard. When reading pressure gauges, datasheets, or digital displays, always confirm the unit prefix — a missing "milli" or "kilo" can result in dangerous overpressure or incorrect system setups.
Converting PSI to bar requires a single multiplication by the exact factor of 0.0689476. Here is the complete step-by-step process:
For converting bar to PSI, multiply the bar value by 14.5038. For example, 4 bar × 14.5038 = 58.015 psi. The bidirectional calculator above handles all of this automatically and simultaneously outputs kPa, Pa, atm, and mbar — giving you a complete multi-unit pressure picture in a single step, ideal for tyre services, compressor setup, hydraulic engineering, and cross-referencing international equipment datasheets.
For related pressure conversions that complement psi/bar work, our Pascals to Millibars Converter and Pascals to kg/cm² Converter are useful companion tools for complete pressure unit coverage.
The Bureau International des Poids et Mesures (BIPM) maintains official SI definitions for all pressure units including the pascal, which underpins both the psi and bar conversion factors. The BIPM provides authoritative guidance on unit definitions, conversion factors, and the proper use of pressure units in science, engineering, and international commerce.
Visit BIPM →Explore our full library of free conversion tools covering pressure, weight, length, area, energy, and time — all built for fast, accurate results on any device, fully optimised for both desktop and mobile users with complete multi-unit breakdowns in every result panel for professional and everyday engineering use.
Browse All Converters →Need to convert between pascals and millibars for meteorology or atmospheric science? Our Pascals to Millibars converter provides instant results with a full breakdown including hPa, kPa, bar, atm, and psi — making it the perfect companion tool alongside psi-to-bar conversion for complete pressure unit coverage across all disciplines.
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