Convert Kilopascals to PSI
Kilopascals to psi is the conversion you need when a pressure is given in metric kPa but you think in pounds per square inch — most often with tire pressures, since newer cars often list kPa while US gauges read psi. One kilopascal is approximately 0.145038 psi, so the psi number always comes out smaller.
Kilopascals to Pounds per square inch conversion table
| Kilopascals (kPa) | Pounds per square inch (psi) |
|---|---|
| 1 | 0.145038 |
| 2 | 0.290075 |
| 3 | 0.435113 |
| 5 | 0.725189 |
| 10 | 1.450377 |
| 20 | 2.900755 |
| 50 | 7.251887 |
| 100 | 14.503774 |
| 500 | 72.518869 |
| 1,000 | 145.037738 |
The formula
To convert kilopascals to psi, multiply the number of kilopascals by 0.14503773773020923:
psi = kilopascals × 0.14503773773020923
A worked example
Say you have a tire pressure of 100 kPa and want it in psi:
100 × 0.14503773773020923 = 14.503774 psi
So 100 kilopascals is approximately 14.503774 psi.
Why it's an approximation
The psi — pounds per square inch — is an imperial unit built from the pound and the inch, and it doesn't divide evenly from the pascal. That leaves a long factor, 0.14503773773020923, that never settles into a tidy fraction, so any value you write down is rounded at some point. For everyday work 0.145038 is close enough, but the underlying number keeps going, which is why the conversion stays approximate.
When you'll use it
Checking tire pressures — many newer cars list the recommended pressure in kPa while US gauges and pumps read psi — plus reading metric equipment specs against imperial tools, or comparing a kPa datasheet value to a psi-rated part.
Frequently asked questions
How many psi are in a kilopascal?
About 0.145038 psi. It's a rounded figure — the exact value runs on past several decimal places, so 0.145038 is the practical number to use.
What's 100 kPa in psi?
About 14.503774 psi. That's close to a common tire-pressure figure, which is why kPa-to-psi comes up so often when checking tires.
Is the kilopascals to psi conversion exact?
No. The psi is an imperial unit that doesn't divide evenly from the pascal, so the factor 0.14503773773020923 is rounded for everyday use. More decimal places give you more precision if you need it.