Convert pressure from psi to bar, kilopascals, atmospheres and millimeters of mercury. Useful for tires, compressors and gauges. Free, private, and runs entirely in your browser.
Multiply the pressure in psi by 0.0689475729 to get bar. The other units use fixed factors that follow from the definitions of the pound-force, the inch and the pascal.
How many bar is 30 psi? About 2.07 bar, or 206.8 kPa.
How many psi is 1 bar? About 14.504 psi.
A tire is inflated to 30 psi. In bar that is 30 × 0.06895 ≈ 2.07 bar, which is 206.8 kPa or about 2.04 atm.
Is a bar the same as an atmosphere? Almost. One atmosphere is 1.01325 bar.
What is kPa? Kilopascals are the SI unit of pressure in thousands of pascals, used by many tire gauges and in engineering.
The bar was introduced by the meteorologist Napier Shaw in 1909 as a convenient unit for atmospheric pressure, close to one atmosphere. The SI unit, the pascal, was adopted in 1971. The psi, or pound-force per square inch, remains common in the United States for tires, compressors and hydraulics.
Use this converter for tires, air compressors, scuba cylinders, boilers and hydraulic gauges when the equipment and the specification use different units. A road bicycle tire at 100 psi is about 6.9 bar. Always follow the manufacturer's limits.
How do I convert bar to psi? Multiply bar by 14.5038.
What is the pressure of the atmosphere? About 14.696 psi, 1.01325 bar or 101.325 kPa at sea level.