Convert Kilopascal to Pound per Square Inch (kPa → psi)

Converting kilopascals to psi is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in kilopascals

   Start with the number of kilopascals (kPa) you want to convert.
2. 2
   Multiply by 0.145038

   The conversion factor from kPa to psi is 0.145038. Multiply your value by this number.
3. 3
   Read the result in psi

   The result is your value in psi (psi).

Multiply the value in kilopascals by 0.145038. For the reverse direction, multiply by 6.894757.

• ✓1 kPa = 1000 Pa = 0.01 bar = 0.145 psi.
• ✓100 kPa ≈ 1 bar.
• ✓Commonly used on tyre manuals in Commonwealth countries.

• ✗Confusing kPa with kW or kJ.
• ✗Using kPa when bar would be simpler.
• ✗Mixing absolute and gauge in kPa without specification.

What is the Kilopascal?

The kilopascal equals 1,000 pascals and is the standard everyday pressure unit on tire labels (in metric countries), weather forecasts (often expressed as hPa or hectopascals, where 100 kPa = 1 atmosphere), and modern engineering documents. Car tire pressures are typically 200–250 kPa (29–36 psi), medical blood-pressure cuffs measure in mmHg but research increasingly uses kPa, and industrial process pressures are routinely given in kPa. The kilopascal is the most-used pressure unit in metric engineering practice, replacing the older 'kg/cm²' (kilogram-force per square centimeter, ≈ 98 kPa). It relates to the pascal (1,000 Pa = 1 kPa), the megapascal (1,000 kPa = 1 MPa), the bar (1 bar = 100 kPa), the psi (1 psi ≈ 6.895 kPa), and the atmosphere (1 atm ≈ 101.325 kPa). European tire pressure labels universally use kPa or bar.

• Tyre pressures in Canada, Australia
• Engineering pressure specs
• Weather pressure in some contexts

What is the Pound per Square Inch?

Pounds per square inch (psi) equals approximately 6,895 pascals and is the standard pressure unit in American tire pressures, hydraulics, and gas-cylinder specifications. American car tires are typically inflated to 30–35 psi, household water systems run at 40–60 psi, and scuba tanks are filled to 3,000 psi (about 200 bar). The psi is essential in American engineering for stress calculations, hydraulic systems, and pneumatic equipment. Two variants exist: 'psig' (gauge, measured above atmospheric) and 'psia' (absolute, including atmosphere) — gauge is the default unless specified. The psi relates to the pascal (1 psi ≈ 6,895 Pa), the kilopascal (1 psi ≈ 6.895 kPa), the bar (14.504 psi = 1 bar), the atmosphere (14.696 psi = 1 atm), and the inch of mercury (1 inHg ≈ 0.491 psi). Outside the US, kPa or bar dominate.

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