Kilopascals to psi converter

Kilopascals provide an SI-based pressure scale used in specifications and weather data. Before comparing a reading with another gauge, identify whether both readings use the same pressure reference. A unit conversion alone does not correct for altitude or sensor calibration.

One kilopascal is about 0.1450377377 psi. One psi is one pound-force per square inch, about 6,894.757 pascals.

Multiply the number of kilopascals by 0.1450377377. For example, 220 kPa × 0.1450377377 = 31.908302 psi. To go the other way, divide by 0.1450377377.

Multiply by 0.145. That is 0.02602% low of the exact factor 0.1450377377, so 220 kPa comes out as 31.9 psi instead of 31.9083.

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “220 kPa to psi” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.