Convert psi to kpa (pounds per square inch to kilopascals)

One psi is exactly 6.894757293168361 kilopascals, derived from the exact pound-force and the exact square inch.

Worked through: 20 psi x 6.89475729 = 137.895 kPa.

Going the other way, one kilopascal is 0.1450377377 pounds per square inch.

For mental arithmetic: Multiply by 6.9.

Kilopascals are what most of the world's tire placards and medical gas regulators use, bar being an industrial convention. The useful anchors: 100 kPa is about 14.5 psi and is also roughly one atmosphere, so a kPa figure read as 'percent of an atmosphere' is close enough for a mental check. Canadian and Australian tire placards are in kPa, which is why a car imported from either shows 240 where an American one shows 35.

Precision is worth matching to the input. A measurement given as 1 psi carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.