PSI to kPa Converter
Type psi to get kPa. 35 psi is about 241 kPa, the figure on many Canadian and Australian tire placards.
35 psi =
241.317kPa
35 pounds per square inch is 241.317 kilopascals.
- 1 psi
- 6.8948 kPa
- 1 kPa
- 0.145 psi
How to convert psi to kPa
Multiply psi by 6.89476. The factor comes from forcing one pound-force (exactly 4.4482216152605 newtons) onto one square inch (exactly 0.00064516 m²), which works out to 6,894.757 pascals, or 6.894757 kilopascals. The six-figure multiplier used here is rounded; the converter keeps the full value.
A shop air line set to 50 psi delivers 50 × 6.89476 = 344.7 kPa. Building codes and plumbing specs in metric countries usually quote water pressure in kPa, so 50 psi of mains pressure appears there as roughly 345 kPa.
kilopascals = pounds per square inch × 6.89476 (rounded)
- One psi is 6.894 757 kPa; the kilopascal itself is a thousand pascals, and a pascal is one newton per square meter. Source: NIST SP 811, Appendix B.8: conversion factors by unit.
How to estimate psi to kPa in your head
Multiply by 7, then knock off about 1.5%. 30 psi × 7 = 210, less 3 gives 207, and the exact answer is 206.8 kPa. Times 7 on its own is a fine first guess, never more than 2% high.
Two anchors help: 1 psi is close to 7 kPa, and 14.7 psi (one atmosphere) is 101.3 kPa, so “about a hundred kPa per atmosphere” keeps the scale in mind.
PSI to kPa table
Common inflation, water and air-tool pressures in kilopascals.
| Pounds per square inch (psi) | Kilopascals (kPa) | Example |
|---|---|---|
| 1 | 6.8948 | |
| 5 | 34.4738 | |
| 12 | 82.7371 | |
| 14.7 | 101.353 | one atmosphere |
| 22 | 151.685 | |
| 26 | 179.264 | |
| 29 | 199.948 | |
| 31 | 213.737 | |
| 34 | 234.422 | |
| 37 | 255.106 |
Show all 18 rowsShow fewer
| 38 | 262.001 | |
| 42 | 289.58 | |
| 44 | 303.369 | max printed on many car tire sidewalls |
| 51 | 351.633 | max printed on many tire sidewalls |
| 55 | 379.212 | |
| 70 | 482.633 | |
| 75 | 517.107 | |
| 125 | 861.845 |
Frequently Asked Questions
What is 35 psi in kPa?
35 psi is 241.3 kPa. Placards that list both units often round it to 240 or 241 kPa.
Why does my tire sidewall show a maximum like 44 psi / 300 kPa?
That is the most the tire is built to hold, not what you should inflate it to. 44 psi is 303.4 kPa, printed as 300. Use the pressure on the car’s door placard, which is usually lower.
Is kPa gauge or absolute?
Either, just like psi. A tire figure in kPa is gauge pressure (above the surrounding air). Engineering sheets sometimes write kPa(g) or kPa(a) to say which.
How do I get MPa from psi?
Convert to kPa, then divide by 1,000. 3,000 psi is 20,684 kPa, which is 20.7 MPa, a figure you see for hydraulic systems and concrete strength.