Convert kPa to psi
Convert kPa to psi instantly. 1 kPa = 0.145038 psi. Formula, worked examples and a quick reference table.
Last updated
One kilopascal equals 0.145038 psi. To convert any number of kilopascals to psi, multiply by 0.14503774.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Pressure conversions are dominated by one everyday task: inflating a tyre. The United States and the United Kingdom quote psi, most of Europe uses bar, Canada and Australia use kilopascals, and the figure on the door jamb may not match the unit on the gauge. Beyond tyres, the same conversions serve weather reporting, diving, and any engineering work where a specification and an instrument were made in different markets.
kPa to psi formula
To go the other way, use kilopascal = psi ÷ 0.14503774.
About these units
The kilopascal is 1,000 pascals. It is the standard pressure unit in Canada, Australia and most engineering work, including tyre pressures.
Pounds per square inch remains the standard for tyre pressure in the US and UK, while most of the world uses bar or kilopascals.
Kilopascal is also written kilopascals. PSI is also written pounds per square inch and lb/in2.
Sources
- National Bureau of Standards, "Refinement of Values for the Yard and the Pound", Federal Register, 1 July 1959 — the international yard as exactly 0.9144 m and the avoirdupois pound as exactly 0.45359237 kg.
- NIST Special Publication 811, Guide for the Use of the International System of Units (SI), 2008 edition — conversion factors for units outside the SI.
kPa to psi conversion table
| Kilopascal | PSI |
|---|---|
| 1 kPa | 0.145 psi |
| 2 kPa | 0.2901 psi |
| 3 kPa | 0.4351 psi |
| 5 kPa | 0.7252 psi |
| 10 kPa | 1.4504 psi |
| 20 kPa | 2.9008 psi |
| 25 kPa | 3.6259 psi |
| 50 kPa | 7.2519 psi |
| 100 kPa | 14.5038 psi |
| 250 kPa | 36.2594 psi |
| 500 kPa | 72.5189 psi |
| 1,000 kPa | 145.0377 psi |
Frequently asked questions
How many psi are in a kilopascal? +
There are 0.145038 psi in one kilopascal.
What is 10 kPa in psi? +
10 kPa equals 1.4504 psi. Multiply 10 by 0.14503774.
How do I convert psi back to kilopascal? +
Use kilopascal = psi ÷ 0.14503774. The converter above handles both directions, or see our dedicated psi to kPa page.
How accurate is this kilopascal to psi conversion? +
The factor used is 0.1450377377, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate kPa to psi in my head? +
Divide by 6.89. That is 0.06905% off the exact factor of 0.145038, which is fine for a rough figure and not for anything that has to balance.