kPa to PSI Converter
Convert kilopascals to pounds per square inch — the SI unit into the imperial one. Results update as you type; exact factors shown.
One kilopascal is 0.145 pounds per square inch — see the exact factor, not a rounded rule of thumb.
How the kpa to psi converter works
Pressures convert through the pascal (1 N/m²). One bar is exactly 100 kPa; a standard atmosphere is exactly 101.325 kPa; 1 psi is 6.894757 kPa (a pound-force on a square inch); 1 mmHg is 133.322 Pa by the conventional definition.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 10 kPa | 1.4504 psi | kilopascals to pounds per square inch |
| 50 kPa | 7.2519 psi | kilopascals to pounds per square inch |
| 100 kPa | 14.5038 psi | kilopascals to pounds per square inch |
| 101.325 kPa | 14.6959 psi | kilopascals to pounds per square inch |
| 150 kPa | 21.7557 psi | kilopascals to pounds per square inch |
| 200 kPa | 29.0075 psi | kilopascals to pounds per square inch |
| 220 kPa | 31.9083 psi | kilopascals to pounds per square inch |
| 250 kPa | 36.2594 psi | kilopascals to pounds per square inch |
| 300 kPa | 43.5113 psi | kilopascals to pounds per square inch |
| 500 kPa | 72.5189 psi | kilopascals to pounds per square inch |
| 700 kPa | 101.5264 psi | kilopascals to pounds per square inch |
| 1,000 kPa | 145.0377 psi | kilopascals to pounds per square inch |
Units in this converter and their exact factors
| Unit | Symbol | One unit in pascals |
|---|---|---|
| pascal | Pa | 1 pascal |
| kilopascal | kPa | 1,000 pascal |
| megapascal | MPa | 1,000,000 pascal |
| bar | bar | 100,000 pascal |
| millibar (hectopascal) | mbar | 100 pascal |
| standard atmosphere | atm | 101,325 pascal |
| pound per square inch | psi | 6,894.757293168 pascal |
| millimeter of mercury | mmHg | 133.322387415 pascal |
| inch of mercury | inHg | 3,386.389 pascal |
FAQFrequently asked questions about pressure conversion
How many psi is 1 kPa?
0.145 psi.
What is atmospheric pressure?
101.325 kPa, which is 14.7 psi.
What tyre pressure is 220 kPa?
31.9 psi.
Why do some gauges use kPa?
Because the pascal is the SI unit; many countries label tyres in kPa and bar as well as psi.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.