A bar is exactly 100,000 pascals.
Bars to Kilopascals Converter — bar to kPa
Convert Bar (bar) to Kilopascal (kPa) using the exact conversion factor (1 bar = 100 kilopascal). See the formula, worked examples, conversion table, history, and common uses.
Bars to Kilopascals converter
Converter
Pressure Converter
Convert pascals, bars, PSI, atmospheres, mercury columns, water columns, and engineering pressure units.
Context values
Some unit families need one extra value for a physically accurate result.
Kilopascal is 1000 pascal units.
Result = input x 100000 / 1000.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Bars to Kilopascals
Bar and Kilopascal both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Bar is most often used for tire pressure specifications outside the us.
Formula
kilopascals = bars × 100
This factor comes from each unit's defined relationship to the category's base unit: 1 bar equals 100000 base units, and 1 kilopascal equals 1000 base units, so dividing one by the other gives the direct bar-to-kilopascal factor of 100.
Simple example
1 bar × 100 = 100 kPa
1 bar = 100 kilopascals.
Real-world example
35 bar × 100 = 3,500 kPa
35 bars = 3,500 kilopascals.
Conversion table
| Bar (bar) | Kilopascal (kPa) |
|---|---|
| 1 bar | 100 kPa |
| 5 bar | 500 kPa |
| 10 bar | 1,000 kPa |
| 25 bar | 2,500 kPa |
| 50 bar | 5,000 kPa |
| 100 bar | 10,000 kPa |
Reverse conversion: Kilopascal to Bar
100 kPa × 0.01 = 1 bar
100 kilopascals = 1 bar.
bars = kilopascals × 0.01
For a page dedicated to this direction, see Kilopascal to Bar.
Understanding the Bar
Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.
Where it's used: Widely used in Europe and most of the world for tire pressure, weather, and industrial pressure
Uses of the Bar today
- Tire pressure specifications outside the US
- Meteorology (weather maps commonly use millibars, hPa)
- Industrial and hydraulic pressure ratings in metric-system countries
History of the Bar
The bar was proposed by Norwegian meteorologist Vilhelm Bjerknes around 1906 as a convenient round pressure unit close to atmospheric pressure, derived from the CGS unit system (one bar equals one million dynes per square centimeter).
Though not an SI unit, the bar remains in wide practical use, particularly in meteorology (as the millibar, now more often written as the equivalent hectopascal) and in tire and hydraulic pressure specifications across most of the world.
Historical origin. Bar was not the invention of a single named person; it developed through the process described above.
Understanding the Kilopascal (kPa)
Kilopascal is 1000 pascal units.
Bar — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the bar among accepted non-SI pressure units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilopascals are in 1 bar?
1 bar equals 100 kilopascals, using the exact defined conversion factor rather than an estimate.
How do I convert bar to kilopascal?
Multiply the bar value by 100. The converter above does this instantly to whatever precision you set.
How do I convert kilopascal back to bar?
Use the reverse factor: 1 kilopascal equals 0.01 bars. You can also use the swap control in the converter above to flip the direction instantly.
What is a bar?
Bar (bar) measures pressure. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). It is classified as a Non-SI metric unit accepted for use with SI.
What is a kilopascal?
Kilopascal (kPa) is a unit of pressure.
Is the bar to kilopascal conversion exact?
Yes. A bar is defined as exactly 100,000 pascals, close to (but distinct from) one standard atmosphere (101,325 Pa). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the bar still used today?
Widely used in Europe and most of the world for tire pressure, weather, and industrial pressure