Pressure Converter
Convert psi, bar, pascal, kPa, and atmospheres.
This pressure converter switches between common pressure units - psi, bar, pascal, kilopascal, and atmospheres - each used in different contexts from tire inflation to weather reporting to scientific measurement.
Enter a pressure value in any supported unit, and the calculator returns the equivalent in your chosen target unit.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 32 psi (car tire) to bar | ≈2.21 bar | 32 ÷ 14.5038 ≈ 2.21 bar. |
| 1 atmosphere to kPa | 101.325 kPa | 1 atm is defined as exactly 101,325 pascals, or 101.325 kPa. |
Key Pressure Conversion Factors
1 atmosphere = 101,325 pascals = 101.325 kPa = 1.01325 bar = 14.696 psi. These relationships all stem from the pascal being the SI base unit of pressure, with the atmosphere defined as approximately average sea-level air pressure.
Where Each Unit Is Commonly Used
PSI (pounds per square inch) is standard for tire pressure and many US engineering contexts, bar and kPa are common in most of the world for general and scientific use, and atmospheres are often used in chemistry and weather contexts - the right unit to use often depends on regional convention or the specific field of application.
How to Use the Pressure Converter
- Open the Pressure Converter and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the pressure converter works.
Frequently Asked Questions
How do you convert PSI to bar?
Divide the PSI value by approximately 14.5038 to convert to bar, since 1 bar equals about 14.5038 psi.
What is the relationship between pascal and atmosphere?
1 standard atmosphere equals 101,325 pascals (101.325 kPa), a defined reference value approximately equal to average sea-level air pressure.
Why is tire pressure usually measured in PSI in the US?
PSI is the conventional pressure unit in US engineering and automotive contexts, while most of the rest of the world uses bar or kPa for the same purpose - both measure the same physical quantity, just in different units.
How do I use this pressure converter?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Pressure Converter calculate?
Convert psi, bar, pascal, kPa, and atmospheres. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this pressure use?
The formula is: target = source * conversion factor. The pascal, the SI unit of pressure, is named for 17th-century French mathematician and physicist Blaise Pascal, whose experiments with barometers and atmospheric pressure in the 1640s helped establish that air pressure decreases with altitude - a finding that directly contradicted the prevailing Aristotelian belief that 'nature abhors a vacuum' and helped usher in modern experimental physics.
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Last updated: September 27, 2026.