kPa to PSI Converter

How to convert kilopascals to pounds per square inch

1 kilopascal = 0.1450377377 pounds per square inch. To convert kilopascals to pounds per square inch, divide by 6.894757293 (or multiply by 0.1450377377). A kilopascal is 1,000 pascals; standard atmospheric pressure is 101.325 kPa. One psi is one pound-force on one square inch, exactly 6,894.757293168 Pa.

Worked examples

• 220 kilopascals = 31.9083 psi (220 ÷ 6.8947573)
• 500 kilopascals = 72.5189 psi (500 ÷ 6.8947573)
• 1,000 kilopascals = 145.038 psi (1,000 ÷ 6.8947573)

Where this conversion comes up

Kilopascals are used for tire pressure outside the US, weather and engineering; pounds per square inch for tire pressure, compressors and plumbing in the US. One kilopascal is 0.145 psi, so a tire label reading 220 kPa means 31.9 psi and 101.325 kPa (one atmosphere) is 14.7 psi. Canadian, Australian and Japanese tire placards use kPa.

Quick estimate

Divide by 7 (1.5% high): 240 kPa ≈ 34 psi, exact 34.8.

Common mistakes

• Multiplying instead of dividing. A pound per square inch is larger than a kilopascal, so the number of pounds per square inch must come out smaller: 220 kilopascals = 31.9083 psi.
• Rounding too early. Keep the full factor until the last step; rounding 0.145 to 0.15 first puts large values noticeably off.

Going the other way? Use the psi to kpa converter. Related pressure converters: bar to psi, psi to bar, mpa to psi, psi to mpa.