Convert Pressure Units Instantly
Convert bar to PSI instantly using the standard pressure conversion factor. Enter any bar value to get pounds per square inch, or switch to the reverse and multi-unit converters for PSI, kPa, MPa and atmosphere conversions.
Choose a conversion mode, enter the pressure value and get a clear pressure result with the formula used.
Enter pressure in bar to convert it into pounds per square inch.
Enter any positive or negative pressure value as needed.
Convert pounds per square inch back to bar.
Useful for tire, compressor and equipment specifications.
Convert bar into kilopascals, megapascals and pascals.
1 bar = 100 kPa = 0.1 MPa.
Enter a pressure value and choose its unit to see equivalent values in the most common pressure units.
To convert bar to PSI, multiply the pressure in bar by 14.5037738. The calculation is linear, which means every additional bar adds another 14.5037738 pounds per square inch. For quick estimates, many people round the factor to 14.5. For equipment specifications, calibration work or technical documentation, keeping more decimal places reduces rounding error.
Example: 2.5 bar × 14.5037738 = 36.2594345 PSI.
The reverse calculation is just as simple. To convert PSI to bar, multiply PSI by 0.0689475729, or divide the PSI reading by 14.5037738. This relationship makes it easy to move between metric pressure labels and U.S. pressure specifications.
Bar is a metric pressure unit widely used on pressure gauges, compressors, pumps, industrial equipment, pressure washers, pneumatic systems and vehicle tire labels. One bar is defined as exactly 100,000 pascals. It is close to normal atmospheric pressure at sea level, which makes values expressed in bar intuitive in many everyday and engineering applications.
Bar is not an SI base or derived unit in the strict SI system, but it remains common in technical and commercial specifications. You will often see decimal values such as 2.2 bar, 2.5 bar or 3.0 bar for tire pressure, while industrial systems may use tens, hundreds or even thousands of bar.
PSI means pounds per square inch. It expresses pressure as pounds-force acting over one square inch. PSI is widely used in the United States for tire inflation, air compressors, hydraulic systems, pressure washers, water systems and many mechanical specifications.
Because bar and PSI describe the same physical quantity using different unit systems, they can be converted directly. A higher bar reading always corresponds to a proportionally higher PSI reading. For example, 1 bar is about 14.5 PSI, 2 bar is about 29 PSI, and 10 bar is about 145 PSI.
A few common examples make the relationship easier to remember. If a tire specification shows 2.2 bar, multiply 2.2 by 14.5037738 to get about 31.91 PSI. A 2.5 bar setting is about 36.26 PSI. A 3 bar pressure is about 43.51 PSI, while a 6 bar compressor setting is about 87.02 PSI.
Use this table for quick reference. The PSI values are rounded to four decimal places. The kPa and MPa columns are included because pressure specifications often mix several metric and imperial units.
| Bar | PSI | kPa | MPa |
|---|---|---|---|
| 0.1 bar | 1.4504 PSI | 10 kPa | 0.010 MPa |
| 0.5 bar | 7.2519 PSI | 50 kPa | 0.050 MPa |
| 1 bar | 14.5038 PSI | 100 kPa | 0.100 MPa |
| 1.5 bar | 21.7557 PSI | 150 kPa | 0.150 MPa |
| 2 bar | 29.0075 PSI | 200 kPa | 0.200 MPa |
| 2.5 bar | 36.2594 PSI | 250 kPa | 0.250 MPa |
| 3 bar | 43.5113 PSI | 300 kPa | 0.300 MPa |
| 4 bar | 58.0151 PSI | 400 kPa | 0.400 MPa |
| 5 bar | 72.5189 PSI | 500 kPa | 0.500 MPa |
| 6 bar | 87.0226 PSI | 600 kPa | 0.600 MPa |
| 8 bar | 116.0302 PSI | 800 kPa | 0.800 MPa |
| 10 bar | 145.0377 PSI | 1000 kPa | 1.000 MPa |
| 15 bar | 217.5566 PSI | 1500 kPa | 1.500 MPa |
| 20 bar | 290.0755 PSI | 2000 kPa | 2.000 MPa |
| 30 bar | 435.1132 PSI | 3000 kPa | 3.000 MPa |
| 50 bar | 725.1887 PSI | 5000 kPa | 5.000 MPa |
| 100 bar | 1450.3774 PSI | 10000 kPa | 10.000 MPa |
| 200 bar | 2900.7548 PSI | 20000 kPa | 20.000 MPa |
| 300 bar | 4351.1321 PSI | 30000 kPa | 30.000 MPa |
Tire-pressure labels often use bar, PSI or kPa. The converter can translate the units, but the correct target pressure must come from the vehicle manufacturer, equipment manufacturer or the applicable tire specification. Do not choose a tire pressure simply because it is a common converted value. Passenger vehicles, motorcycles, bicycles, trailers and commercial vehicles can require very different pressures.
For example, 2.3 bar converts to about 33.36 PSI and 2.4 bar converts to about 34.81 PSI. Those values are mathematically correct, but whether either value is appropriate depends on the vehicle and operating conditions. Always distinguish a recommended cold-tire pressure from a pressure measured after driving, when the air inside the tire may be warmer.
Air tools and compressors frequently show working pressure in either bar or PSI. A compressor rated at 8 bar is approximately 116.03 PSI, while a 10 bar compressor is approximately 145.04 PSI. Pumps and pressure washers may use bar because the numbers remain compact; 100 bar is about 1,450.38 PSI, and 200 bar is about 2,900.75 PSI.
The conversion tool only translates units. It does not determine a safe operating pressure. Maximum allowable working pressure, relief-valve settings, hose ratings, fittings and equipment limits must come from the manufacturer or qualified engineering documentation.
Pressure units are related by fixed mathematical ratios. One bar equals 100 kPa, 0.1 MPa and approximately 14.5038 PSI. One MPa equals 10 bar and about 145.038 PSI. These relationships are useful when drawings, gauges and equipment manuals use different unit systems.
For engineering calculations, kPa and MPa are especially convenient because they are decimal multiples of the pascal. PSI remains common in U.S. mechanical and automotive work, while bar is common on international equipment and many pressure gauges. The multi-unit converter above lets you move between all of these without manually chaining several formulas.
The unit conversion factor does not change between gauge and absolute pressure, but the reference point does. Gauge pressure is measured relative to local atmospheric pressure. Absolute pressure is measured relative to a perfect vacuum. That means 2 bar gauge and 2 bar absolute are not physically the same condition even though both numerical values convert to about 29.01 PSI in their corresponding gauge or absolute scales.
When reading technical documentation, look for labels such as barg, bara, psig or psia. Convert gauge to gauge and absolute to absolute unless you intentionally account for atmospheric pressure. This distinction can matter in vacuum systems, process equipment, compressors and instrumentation.
Rounding 1 bar to 14.5 PSI is fine for many quick estimates. The difference becomes more noticeable when the pressure is large or when several calculations are combined. At 300 bar, using 14.5 gives 4,350 PSI, while the more accurate factor gives about 4,351.13 PSI. The difference is small as a percentage, but precision requirements vary by application.
For ordinary tire-pressure reading, a tenth of a PSI may not matter. For calibration, testing, hydraulic design or engineering documentation, use the precision required by the governing procedure and the measurement instrument. Do not report more decimal places than the original measurement actually supports.
If you are building a full pressure-conversion workflow, related pages can include a PSI to Bar Converter, Bar to kPa Converter, kPa to PSI Converter and MPa to PSI Converter. These conversions are especially useful when a gauge, manual, drawing or manufacturer specification uses a different pressure unit from the one you normally work with.
The same pressure can be expressed in different units. The numerical value changes, but the physical pressure does not.
The mathematical relationships used on this page are based on standard unit definitions. One bar is exactly 100,000 pascals. PSI is derived from pound-force per square inch. For broader SI guidance and unit definitions, consult authoritative measurement references such as the National Institute of Standards and Technology (NIST) and the Bureau International des Poids et Mesures (BIPM).
This converter is intended for unit conversion and educational reference. It does not replace manufacturer instructions, calibration procedures, pressure-system design calculations, code requirements or qualified engineering judgment.
Quick answers about bar, PSI and common pressure conversions.
1 bar equals approximately 14.5037738 PSI. For most everyday calculations, 14.504 PSI is accurate enough.
Multiply the pressure in bar by 14.5037738. Formula: PSI = bar × 14.5037738.
Divide PSI by 14.5037738, or multiply PSI by 0.0689475729. Formula: bar = PSI × 0.0689475729.
Yes. 2 bar equals about 29.0075 PSI, commonly rounded to 29.01 PSI.
2.5 bar equals about 36.2594 PSI.
3 bar equals about 43.5113 PSI.
5 bar equals about 72.5189 PSI.
10 bar equals about 145.0377 PSI.
No. Both measure pressure, but they are different units. Bar is a metric pressure unit, while PSI means pounds per square inch.
PSI stands for pounds per square inch. It describes the amount of force in pounds applied over one square inch.
Bar is a unit of pressure. One bar equals exactly 100,000 pascals, which is close to typical atmospheric pressure at sea level.
Yes, for unit conversion. However, always use the vehicle or tire manufacturer's specified pressure and be clear whether the value is a cold-tire recommendation.
Yes. The mathematical conversion is the same for compressors, pressure washers, pumps and other pressure equipment. Equipment limits must still come from the manufacturer.
The unit ratio is the same, but gauge and absolute pressure have different reference points. Convert like-for-like values and do not mix bar gauge with bar absolute without accounting for atmospheric pressure.