UnitConvConvert
psi
Pressureimperialengineeringeveryday

What is a pound per square inch?

The US engineering and tyre-pressure unit — 6895 Pa

Definition

Pounds per square inch equals approximately 6895 Pa. It is the dominant pressure unit in the US — tyre pressures, plumbing, compressed air. Standard US tyre pressure: 32–35 psi.

Common uses

  • US tyre pressures
  • US plumbing and water system specs
  • US compressed-air tool ratings

🌍 Real-world scale

US tyre: 32–35 psi. Water supply: 40–60 psi. SCUBA tank: 3000 psi. Car AC system: 30–200 psi.

Convert from psi

9 conversions
Pound per Square Inch to Pascal1 psi = 6,894.76 PaPound per Square Inch to Kilopascal1 psi = 6.89476 kPaPound per Square Inch to Megapascal1 psi = 0.006895 MPaPound per Square Inch to Bar1 psi = 0.06895 barPound per Square Inch to Millibar1 psi = 68.9476 mbarPound per Square Inch to Atmosphere1 psi = 0.06805 atmPound per Square Inch to Millimeter of Mercury1 psi = 51.7149 mmHgPound per Square Inch to Torr1 psi = 51.7149 TorrPound per Square Inch to Inch of Mercury1 psi = 2.03602 inHg

Convert to psi

9 conversions
Pascal to Pound per Square Inch1 Pa = 0.000145 psiKilopascal to Pound per Square Inch1 kPa = 0.145 psiMegapascal to Pound per Square Inch1 MPa = 145.038 psiBar to Pound per Square Inch1 bar = 14.5038 psiMillibar to Pound per Square Inch1 mbar = 0.0145 psiAtmosphere to Pound per Square Inch1 atm = 14.6959 psiMillimeter of Mercury to Pound per Square Inch1 mmHg = 0.01934 psiTorr to Pound per Square Inch1 Torr = 0.01934 psiInch of Mercury to Pound per Square Inch1 inHg = 0.4912 psi

Tips

  • 1 psi ≈ 6.9 kPa = 0.069 bar.
  • 14.7 psi = 1 atm = 1.01 bar.
  • Most US pressure gauges show psi.

Common mistakes

  • Setting a European tyre at 35 bar instead of 35 psi — disaster.
  • Confusing psi (gauge) with psia (absolute).
  • Using psi in scientific papers — prefer Pa or MPa.

FAQ about the pound per square inch

What is a pound per square inch?
Pounds per square inch equals approximately 6895 Pa. It is the dominant pressure unit in the US — tyre pressures, plumbing, compressed air. Standard US tyre pressure: 32–35 psi.
Where is the pound per square inch used?
The pound per square inch is commonly used for: US tyre pressures; US plumbing and water system specs; US compressed-air tool ratings.
What is an example of a pound per square inch in real life?
US tyre: 32–35 psi. Water supply: 40–60 psi. SCUBA tank: 3000 psi. Car AC system: 30–200 psi.
What category does the pound per square inch belong to?
The pound per square inch is a unit of pressure, part of the 10-unit pressure category on UnitConv.
How accurate are pound per square inch conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 10 pressure units and their conversions.🎈 Pressure hub →