Use our psi-to-bar converter for fast pressure unit conversions. Whether you are working with tire pressures, hydraulic systems, or industrial equipment specifications, converting psi to bar is a routine task across many technical fields. Pounds per square inch and bar are two of the most widely used pressure units globally, and this route returns the bar value instantly.
This page uses the shared pressure calculator that currently supports only six units: pascals, kilopascals, bar, atmospheres, psi, and millimeters of mercury. The default pair here is psi to bar. The interface does not decide whether your number is gauge or absolute pressure, and it does not add altitude compensation or fluid-system modeling, so the examples below stay aligned to the six units and constants already implemented in the component.
The shared pressure component defines 1 psi as 6,894.76 pascals and 1 bar as 100,000 pascals. Using those constants, 1 psi converts to 0.0689476 bar on this route.
To convert a pressure value from psi to bar, use the following equation:
Bar = PSI x 0.0689476
This factor comes from the component constants of 6,894.76 pascals per psi and 100,000 pascals per bar. For most practical purposes, rounding to 0.06895 provides sufficient accuracy for engineering and everyday applications, but the route itself follows the shared component constant.
Alternatively, you can express this relationship as:
1 PSI = 0.0689476 bar
1 bar = 14.5038 PSI
These reciprocal values allow you to convert in either direction depending on your needs.
Follow these steps to convert any psi value to bar manually:
Step 1: Identify your pressure value in psi. For example, let us use 30 psi, a common tire pressure for passenger vehicles.
Step 2: Multiply the psi value by 0.0689476. So 30 x 0.0689476 = 2.068.
Step 3: Round to the appropriate number of decimal places for your application. In this case, 30 psi equals approximately 2.07 bar.
Step 4: Verify your result makes sense. Since 1 bar is roughly 14.5 psi, a value of about 2 bar for 30 psi is logical because 2 x 14.5 = 29, which is close to 30.
Let us work through another example. Convert 100 psi to bar:
Step 1: Start with 100 psi.
Step 2: Multiply by 0.0689476: 100 x 0.0689476 = 6.895.
Step 3: Therefore, 100 psi equals approximately 6.895 bar, or roughly 6.9 bar.
PSI, which stands for pounds per square inch, is a unit of pressure commonly used in the United States and other countries that follow imperial or US customary measurement systems. It measures the amount of force in pounds applied over an area of one square inch. The unit is deeply embedded in American engineering, automotive, and industrial standards. Tire pressure gauges, air compressors, and hydraulic system specifications in North America almost universally use psi as their default pressure unit.
Bar is a metric unit of pressure that is widely used across Europe, Asia, and most of the rest of the world. One bar is defined as exactly 100,000 pascals, which is very close to the average atmospheric pressure at sea level (approximately 1.01325 bar). This near-equivalence to atmospheric pressure makes bar an intuitive unit for many practical applications. The bar is not an official SI unit, but it is accepted for use with the SI system and is extensively used in meteorology, engineering, and industry worldwide.
The need to convert between psi and bar arises frequently in international trade, multinational engineering projects, and whenever equipment manufactured in one measurement tradition is used in another. For the reverse calculation, our bar to psi converter handles that direction. For the broader six-unit selector, use the shared pressure converter tool, and for another nearby route in the same cluster, see our atm to psi converter.
Automotive Tire Pressure: One of the most common everyday uses of psi to bar conversion involves tire pressure. In the United States, tire pressures are specified in psi, with typical passenger car tires requiring 30 to 35 psi. In Europe and many other regions, the same measurements are expressed in bar. A tire rated at 32 psi needs approximately 2.21 bar. Many modern tire pressure gauges display both units, but understanding the conversion remains important when reading vehicle manuals or tire sidewall markings from different countries.
Scuba Diving and Compressed Gas: Scuba tank pressures are often rated in both psi and bar depending on the manufacturer and region. A standard aluminum 80 tank is rated to 3,000 psi, which equals approximately 207 bar. Dive computers and regulators from European manufacturers typically display pressure in bar, while American equipment often uses psi. Divers who travel internationally must be comfortable converting between these units to manage their air supply safely.
Industrial Hydraulics and Pneumatics: Hydraulic systems in manufacturing plants, construction equipment, and aerospace applications frequently specify operating pressures in both psi and bar. A hydraulic press operating at 5,000 psi generates approximately 345 bar of pressure. Engineers working with international suppliers or maintaining equipment from different countries need to convert between these units regularly to ensure proper system configuration and safety compliance.
Weather and Atmospheric Science: While meteorologists more commonly use hectopascals or millibars, some weather instruments and reports use psi or bar. Standard atmospheric pressure at sea level is approximately 14.696 psi or 1.01325 bar. Understanding these equivalences helps when interpreting weather data from different sources. For a broader view of pressure conversions, our pressure unit converter supports all major pressure units in one place.
HVAC and Refrigeration: Heating, ventilation, air conditioning, and refrigeration technicians work with refrigerant pressures that may be specified in psi or bar depending on the equipment origin. Proper pressure readings are critical for system charging, leak detection, and performance optimization. A refrigerant system operating at 250 psi on the high side translates to approximately 17.24 bar.
Here are some helpful shortcuts and memory aids for converting psi to bar quickly:
The Divide-by-15 Shortcut: For a fast mental estimate, divide the psi value by 15. Since 1 bar equals approximately 14.5 psi, dividing by 15 gives you a close approximation. For example, 45 psi divided by 15 equals 3 bar. The actual value is 3.10 bar, so this shortcut is accurate within about 3 percent for most practical ranges.
Memorize Common Benchmarks: Knowing a few key reference points makes estimation much easier. 14.5 psi equals 1 bar. 29 psi equals approximately 2 bar. 100 psi equals approximately 6.9 bar. 145 psi equals approximately 10 bar. 1,000 psi equals approximately 68.9 bar. These benchmarks let you quickly bracket any value and estimate the conversion.
The Seven Percent Rule: The conversion factor 0.0689476 is very close to 7 percent. So converting psi to bar is roughly the same as taking 7 percent of the psi value. For 200 psi, 7 percent is 14, so the answer is approximately 14 bar. The calculator returns 13.78952 bar, which is close enough for quick estimates.
If you need to move across more than one pressure unit, the shared pressure converter and the kPa to psi converter are the closest companion tools.
| PSI | Bar |
|---|---|
| 1 | 0.0689 |
| 5 | 0.3447 |
| 10 | 0.6895 |
| 14.5 | 1.0000 |
| 15 | 1.0342 |
| 20 | 1.3790 |
| 25 | 1.7237 |
| 30 | 2.0684 |
| 32 | 2.2064 |
| 35 | 2.4132 |
| 40 | 2.7579 |
| 50 | 3.4474 |
| 75 | 5.1711 |
| 100 | 6.8948 |
| 150 | 10.3421 |
| 200 | 13.7895 |
| 500 | 34.4738 |
| 1000 | 68.9476 |
| 2000 | 137.8951 |
| 3000 | 206.8427 |
The conversion factor from psi to bar on this page is 0.0689476. This means you multiply any pressure value in psi by 0.0689476 to get the equivalent value in bar returned by the shared pressure component. The factor comes from the component constants of 6,894.76 pascals per psi and 100,000 pascals per bar.
Thirty psi equals approximately 2.07 bar. This is a particularly useful conversion to know because 30 to 35 psi is the typical recommended tire pressure for most passenger cars. In bar, this range translates to approximately 2.07 to 2.41 bar. When inflating tires at a service station that displays pressure in bar, knowing this conversion ensures you achieve the correct inflation level for safe driving and optimal fuel efficiency.
The difference stems from the historical adoption of measurement systems. Countries that use the metric system generally adopted bar as their standard pressure unit because it integrates naturally with other metric units and is defined in terms of pascals. The United States and a few other countries that retained imperial or US customary units continued using psi because it is based on pounds and inches. International standardization efforts have not fully resolved this split, so both units remain in widespread use across different industries and regions.
Bar and atmosphere are very close but not identical. One standard atmosphere equals 1.01325 bar, while one bar equals 0.986923 atmospheres. The difference is about 1.3 percent. Standard atmospheric pressure at sea level is defined as exactly 101,325 pascals or 1.01325 bar. The bar was designed to be a convenient round number close to atmospheric pressure, which is why the two units are so similar. For rough estimates, treating 1 bar as equal to 1 atmosphere is acceptable, but for precise scientific or engineering work, the distinction matters.
Standard tire pressure for most passenger vehicles falls between 2.0 and 2.5 bar, which corresponds to approximately 29 to 36 psi. The exact recommended pressure varies by vehicle make and model, tire size, and load conditions. You can find the manufacturer-recommended pressure on a sticker inside the driver-side door jamb or in the vehicle owner manual. Sports cars and performance vehicles may require higher pressures, sometimes up to 2.8 bar or 40 psi, while heavy trucks and commercial vehicles operate at significantly higher pressures.
To convert scuba tank pressure from psi to bar, multiply the psi reading by 0.0689476. A full standard aluminum 80 tank at 3,000 psi equals approximately 207 bar. A half-full tank at 1,500 psi equals approximately 103 bar. Most dive computers and pressure gauges from European manufacturers display bar, while American equipment typically shows psi. When planning dives internationally, being comfortable with both units and their conversion is essential for safe air management and dive planning.
In this calculator, 1 bar corresponds to 14.5037680789469 psi, which is the inverse of the psi-to-bar factor used by the shared component. Knowing that reference point makes it easy to estimate conversions in either direction. For instance, 3 bar is about 43.51 psi.
The numeric factor is the same for gauge and absolute readings, but this route does not infer which one you mean. It simply converts the number you enter from psi units to bar units. If your workflow depends on psig versus psia, you still need to manage that distinction outside the tool.
Use this route when the source pressure value is already in psi and the next workflow expects bar. That is common for tire pressure, compressors, workshop equipment, and industrial references where an imperial-style pressure number must be restated in a metric-friendly form.
If the session also needs kPa, atm, or mmHg, the shared pressure converter is more flexible. This page is strongest when the practical question is specifically psi-to-bar.
Check whether the destination context expects a rounded display value or a more precise pressure figure. Also keep pressure separate from force calculations. For the reverse direction, use Bar to PSI Converter. If the source is actually gauge or absolute pressure in a more specific engineering sense, keep that context visible outside the calculator result.
That is what keeps the page useful. It gives one clean pressure-unit translation without pretending to answer every instrumentation detail around the reading.
Convert PSI to bar instantly.