Convert kilopascals to pounds per square inch

One kilopascal is 0.145037738 pounds per square inch. To convert any amount, multiply by 0.145037738. Going the other way, one pound per square inch is 6.89475729 kilopascals.

Multiply the kilopascal figure by 0.145037738. So psi = kPa × 0.145037738. For a quick mental estimate, dividing by about 6.89 gets you close enough for most everyday purposes.

One kilopascal is a car tyre runs about 220 kPa. The kilopascal is the SI-derived unit used on tyre placards in Canada, Australia and much of Europe, and in weather reporting.

One pound per square inch is a car tyre runs about 32 psi. Psi is the tyre-pressure unit in North America. Car tyres typically run 30–35 psi, and getting this wrong measurably affects both fuel economy and braking distance.

Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding kPa before converting introduces an error the conversion then multiplies.