A bar is exactly 100,000 pascals.
Bars to Pascals Converter — bar to Pa
Convert Bar (bar) to Pascal (Pa) using the exact conversion factor (1 bar = 100,000 pascal). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Bars to Pascals converter
Converter
Scientific Units Converter
Convert SI derived units, scientific notation-friendly units, atomic units, and lab measurements.
Context values
Some unit families need one extra value for a physically accurate result.
The pascal is one newton per square meter.
Result = input x 100000 / 1.
Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Bars to Pascals
Bar and Pascal are both scientific-measurement units, spanning everything from atomic and laboratory scales to astronomical distances — the kind of conversion that comes up constantly in physics, chemistry, and astronomy when a result needs to move between conventions used in different subfields. Bar is typically associated with widely used in Europe and most of the world for tire pressure, weather, and industrial pressure, while Pascal is typically associated with standard scientific pressure unit worldwide.
Formula
pascals = bars × 100000
This factor comes from each unit's defined relationship to the category's base unit: 1 bar equals 100000 base units, and 1 pascal equals 1 base unit, so dividing one by the other gives the direct bar-to-pascal factor of 100000.
Simple example
1 bar × 100000 = 100,000 Pa
1 bar = 100,000 pascals.
Real-world example
10 bar × 100000 = 1,000,000 Pa
10 bars = 1,000,000 pascals.
Conversion table
| Bar (bar) | Pascal (Pa) |
|---|---|
| 0.001 bar | 100 Pa |
| 0.01 bar | 1,000 Pa |
| 1 bar | 100,000 Pa |
| 10 bar | 1,000,000 Pa |
| 100 bar | 10,000,000 Pa |
| 1,000 bar | 100,000,000 Pa |
Reverse conversion: Pascal to Bar
1 Pa × 0.00001 = 0.00001 bar
1 pascal = 0.00001 bars.
bars = pascals × 0.00001
For a page dedicated to this direction, see Pascal to Bar.
Bar vs. Pascal
| Aspect | Bar | Pascal |
|---|---|---|
| Family | Non-SI metric unit accepted for use with SI | SI derived unit |
| Typical use | Tire pressure specifications outside the US | Scientific and engineering pressure measurement worldwide |
| Where it's used | Widely used in Europe and most of the world for tire pressure, weather, and industrial pressure | Standard scientific pressure unit worldwide |
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 Pascal
Pascal (Pa) measures pressure. The pascal is the SI derived unit of pressure: one newton of force per square meter. It is classified as a SI derived unit.
Where it's used: Standard scientific pressure unit worldwide
Uses of the Pascal today
- Scientific and engineering pressure measurement worldwide
- Meteorology (often as hectopascals, equivalent to millibars)
- Material science (stress and strength, typically in megapascals)
History of the Pascal
The pascal is named after Blaise Pascal, whose 17th-century experiments clarified the physics of fluid pressure and vacuum. It was adopted as the SI derived unit of pressure in 1971, replacing the older, non-coherent CGS pressure units used in much scientific work up to that point.
Historical origin. Pascal was not the invention of a single named person; it developed through the process described above.
Bar — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the bar among accepted non-SI pressure units.
Pascal — sources
- BIPM SI Brochure — Coherent derived units — Defines the pascal as the SI unit of pressure.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pascals are in 1 bar?
1 bar equals 100,000 pascals, using the exact defined conversion factor rather than an estimate.
How do I convert bar to pascal?
Multiply the bar value by 100000. The converter above does this instantly to whatever precision you set.
How do I convert pascal back to bar?
Use the reverse factor: 1 pascal equals 0.00001 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 pascal?
Pascal (Pa) measures pressure. The pascal is the SI derived unit of pressure: one newton of force per square meter. It is classified as a SI derived unit.
Is the bar to pascal 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
Why does this category span everything from atomic to astronomical scales?
Scientific work spans an enormous range of physical scales, from atomic distances (measured in angstroms or atomic mass units) to interstellar distances (measured in astronomical units or parsecs), so this category groups SI-derived and scale-specific units that researchers commonly need to convert between within their field.