kPa to psi and psi to kPa converter
kPa to psi: divide by 6.894757, or multiply by 0.145038, so 220 kPa = 31.908 psi. Type kilopascals and the psi appear while you type, with bar and atmospheres underneath; psi to kPa works in the same box.
Example: Pressure 220 · Direction: kPa to psi (kPa → psi) → Answer: 220 kPa = 31.908 psi. Source: NIST SP 811, Appendix B.8 – pound-force per square inch = 6.894757 kPa; standard atmosphere = 101.325 kPa (exact). Updated: .
How it is calculated
The conversion
psi = kPa ÷ 6.894757293168 and kPa = psi × 6.894757293168. One psi is one pound-force on a square inch, which works out to 6,894.757 pascals. So 240 kPa = 34.809 psi, 101.325 kPa = 14.696 psi for one standard atmosphere, and, back again, 35 psi = 241.317 kPa.
Tire placards in kPa
Cars sold in Canada, Australia and Europe list tire pressures in kPa or bar, US gauges read psi. A placard of 220 kPa is 31.908 psi, which is close to the common US 32 psi (32 psi = 220.632 kPa). 240 kPa is 34.809 psi, and the US 35 psi is 241.317 kPa. A bike tire at 600 kPa has 87.023 psi, and a pressure cooker at 15 psi works at 103.421 kPa above room pressure. Check a placard value at the right temperature: tires read cold.
Gauge or absolute?
Tire and cooker gauges show gauge pressure, which is measured against the surrounding air. Absolute pressure adds the atmosphere: a tire at 220 kPa gauge is 321.3 kPa absolute. Weather reports and gas-law calculations use absolute pressure. At sea level the atmosphere is 101.325 kPa, i.e. 14.696 psi. A psi reading marked “psig” is gauge, “psia” is absolute.
Quick estimate
Divide kPa by 7: 350 kPa is about 50 psi (exact: 50.763). The shortcut is 1.5 % low, fine for tires, not for pressure vessels. In the other direction multiply psi by 7 and expect 1.5 % high. See bar to psi for bar and the ideal gas law calculator for absolute pressures.
Frequently asked questions
How many psi is 1 kPa?
1 kPa = 0.145 psi (0.1450377 before rounding). One psi is 6.895 kPa.
How do I convert kPa to psi?
Divide by 6.894757 (or multiply by 0.145038). For 250 kPa: 250 kPa = 36.259 psi.
What is 32 psi in kPa?
32 psi = 220.632 kPa, about 221 kPa, a common car tire pressure.
How many psi is 100 kPa?
100 kPa = 14.504 psi. Standard atmospheric pressure of 101.325 kPa is 14.696 psi.
Is 1 bar 100 kPa?
Yes, 1 bar = 100 kPa exactly, which is 14.504 psi. That is why 2.2 bar equals 220 kPa.
Sources and legal basis
- NIST SP 811, Appendix B.8 – pound-force per square inch = 6.894757 kPa; standard atmosphere = 101.325 kPa (exact)
- BIPM – The International System of Units (SI Brochure, 9th edition)
As of: · Editorial policy
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