Pounds Per Square Inch (PSI) Converter
Convert PSI to bar, kPa, Pa, atm, mmHg, and more. Free online pounds per square inch pressure converter with instant results for engineering and everyday use.
About This Calculator
The Pounds Per Square Inch (PSI) Converter instantly converts PSI pressure values to all major pressure units including bar, kilopascals (kPa), pascals (Pa), atmospheres (atm), millimeters of mercury (mmHg/Torr), inches of mercury (inHg), kilogram-force per square centimeter (kg/cm²), and megapascals (MPa).
PSI (pounds per square inch) is a unit of pressure defined as the force of one pound-force applied to an area of one square inch. It is the primary pressure unit used in the United States and is commonly found on tire pressure gauges, scuba tanks, air compressors, hydraulic systems, and industrial pressure equipment worldwide.
This converter uses the standard conversion factors: 1 PSI = 0.0689476 bar = 6.89476 kPa = 6894.76 Pa = 0.068046 atm = 51.7149 mmHg = 2.03602 inHg = 0.070307 kg/cm² = 0.00689476 MPa. All results are calculated to high precision for engineering and scientific accuracy.
Regional Notes
United States: PSI is the standard pressure unit for tire pressure, water systems, natural gas, and HVAC. Most gauges in the US read in PSI. Tire pressure is typically 30-35 PSI for passenger vehicles.
United Kingdom: While the UK officially uses the metric system, PSI is still commonly used for tire pressure (typically 30-35 PSI for cars), scuba tanks, and air compressors alongside bar measurements. Many UK pressure gauges show both PSI and bar.
India: India uses the metric system (bar, kPa) for most official and industrial pressure measurements. However, PSI is still found on imported equipment, some tire gauges, and in the automotive aftermarket. Tire pressure in India is commonly measured in PSI or bar.
Frequently Asked Questions
How many bar is 1 PSI?
1 PSI equals 0.0689476 bar. To convert PSI to bar, multiply the PSI value by 0.0689476.
How many kPa is 1 PSI?
1 PSI equals 6.89476 kPa. To convert PSI to kilopascals, multiply the PSI value by 6.89476.
How many pascals in 1 PSI?
1 PSI equals 6894.76 pascals (Pa). PSI and pascals are both units of pressure, with PSI being part of the imperial system while pascals are the SI unit for pressure.
How many atmospheres is 1 PSI?
1 PSI equals 0.068046 atmospheres (atm). Standard atmospheric pressure at sea level is 14.6959 PSI or 1 atm.
How many mmHg is 1 PSI?
1 PSI equals 51.7149 mmHg (millimeters of mercury, also called Torr). This conversion is commonly used in medical and vacuum pressure applications.
What is PSI used for?
PSI (pounds per square inch) is widely used to measure tire pressure, scuba tank pressure, hydraulic systems, water pressure, air compressors, and industrial pressure gauges, especially in the United States and countries using imperial units.
What is the standard tire pressure in PSI?
Most passenger car tires require 30 to 35 PSI when cold. Check your vehicle's owner manual or the sticker on the driver's door jamb for the recommended pressure. Under-inflated tires reduce fuel efficiency and increase wear.
How do you convert PSI to kg/cm²?
1 PSI equals 0.070307 kg/cm². To convert PSI to kilogram-force per square centimeter, multiply the PSI value by 0.070307. This unit is commonly used in some Asian and European countries for pressure measurements.