kPa to PSI Converter

Multiply the pressure in kilopascals by 0.145037738 to get pounds per square inch. For example, 100 kPa times 0.145037738 is about 14.5 psi. The factor comes from the exact definition that 1 psi equals 6,894.757 pascals.

Multiply the pressure in psi by 6.894757 to get kilopascals. For example, 32 psi times 6.894757 is about 220.63 kPa. This is the reciprocal of the kPa to psi factor, so the two conversions undo each other exactly.

Most passenger car tires run between 30 and 35 psi, which is roughly 207 to 241 kPa. Many metric gauges and door-jamb stickers list the value in kPa or bar, so this converter helps you match a kPa spec to a psi gauge. Always follow the pressure printed on your vehicle door jamb, not the maximum stamped on the tire sidewall.

The converter does a straight unit conversion and does not assume gauge or absolute pressure. Both psi and kPa use the same sign convention, so the math is identical either way. A tire gauge reads gauge pressure (above the surrounding air), while engineering specs may state absolute pressure, so confirm which one your number refers to.

1 kilopascal equals exactly 1,000 pascals, and 1 bar equals exactly 100,000 pascals, so 100 kPa is exactly 1 bar. The converter also shows the bar and pascal equivalents so you can cross-check a reading against any of the four units at once.

One standard atmosphere is defined as 101,325 pascals, which is 101.325 kPa or about 14.696 psi. That is why a value near 100 kPa or 14.5 psi is close to normal sea-level air pressure. Sea-level tire and pump gauges read this as roughly zero because they measure pressure above the ambient atmosphere.