Convert pounds per square inch to kilopascals

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

Multiply the pound per square inch figure by 6.89475729. So kPa = psi × 6.89475729. For a quick mental estimate, multiplying by about 6.89 gets you within a percent or so, which is close enough for most everyday purposes.

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.

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.

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 psi before converting introduces an error the conversion then multiplies.