Bar to kPa Converter
Convert bar to kilopascals — one bar is exactly 100 kPa. Results update as you type; exact factors shown.
One bar is 100 kilopascals — see the exact factor, not a rounded rule of thumb.
How the bar to kpa 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 UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 0.5 bar | 50 kPa | bars to kilopascals |
| 1 bar | 100 kPa | bar to kilopascals |
| 1.5 bar | 150 kPa | bars to kilopascals |
| 2 bar | 200 kPa | bars to kilopascals |
| 2.2 bar | 220 kPa | bars to kilopascals |
| 2.5 bar | 250 kPa | bars to kilopascals |
| 3 bar | 300 kPa | bars to kilopascals |
| 4 bar | 400 kPa | bars to kilopascals |
| 5 bar | 500 kPa | bars to kilopascals |
| 10 bar | 1,000 kPa | bars to kilopascals |
| 100 bar | 10,000 kPa | bars to kilopascals |
| 200 bar | 20,000 kPa | bars to kilopascals |
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 |
| millimetre of mercury | mmHg | 133.322387415 pascal |
| inch of mercury | inHg | 3,386.389 pascal |
FAQFrequently asked questions about pressure conversion
How many kPa in a bar?
Exactly 100.
Why is the conversion exact?
Because the bar was defined as 100,000 pascals — a round number chosen for convenience, not measured.
What tyre pressure is 2.2 bar?
220 kPa, or about 32 psi.
Which unit do European cars use?
Bar on the tyre placard in much of Europe; kPa in Australia; psi in the US and UK.
Is a bar atmospheric pressure?
Almost — one atmosphere is 1.01325 bar, about 1.3% more.
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 Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.