Pounds per Square Inch to Kilopascals

Pounds per square inch and kilopascals

One psi is the pressure of one pound-force on one square inch: about 6,894.757 pascals, derived from exact definitions. Tire pressure in the US and UK, air compressors, pressure washers and plumbing use psi.

A kilopascal is 1,000 pascals. Tire pressure in Canada and Australia, engineering specs and medical gas pressures use kPa.

Worked example

Convert 35 psi: 35 × 6.894757293 = 241.3165053, so 35 pounds per square inch is 241.3165053 kilopascals. Likewise 20 psi = 137.8951459 kPa.

Estimating in your head

Multiply by 6.9 for a quick figure; it is off by about 0.1%. For 35 psi that gives 242 kPa, against 241.317 exactly.

Going the other way

To convert kilopascals to pounds per square inch, divide by 6.894757293 (or multiply by 0.14503773773). The swap button between the boxes opens that page.

kPa = psi × 6.894757293

1 psi = ≈ 6,894.757293 Pa and 1 kPa = 1,000 Pa, both by definition, so the factor is their ratio: 6.894757293 (rounded here; the page uses the full value). Results drop binary floating-point noise beyond 15 significant digits and display at the precision you choose (6 significant figures by default). Copy result copies the full value.