Gigapascal is 1000000000 pascal units.
Gigapascals to Bars Converter — GPa to bar
Convert Gigapascal (GPa) to Bar (bar) using the exact conversion factor (1 gigapascal = 10,000 bar). See the formula, worked examples, conversion table, history, and common uses.
Gigapascals to Bars 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.
A bar is exactly 100,000 pascals.
Result = input x 1e+9 / 100000.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gigapascals to Bars
Gigapascal and Bar 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. Specifically: Gigapascal is 1000000000 pascal units, and a bar is exactly 100,000 pascals.
Formula
bars = gigapascals × 10000
This factor comes from each unit's defined relationship to the category's base unit: 1 gigapascal equals 1000000000 base units, and 1 bar equals 100000 base units, so dividing one by the other gives the direct gigapascal-to-bar factor of 10000.
Simple example
1 GPa × 10000 = 10,000 bar
1 gigapascal = 10,000 bars.
Real-world example
35 GPa × 10000 = 350,000 bar
35 gigapascals = 350,000 bars.
Conversion table
| Gigapascal (GPa) | Bar (bar) |
|---|---|
| 1 GPa | 10,000 bar |
| 5 GPa | 50,000 bar |
| 10 GPa | 100,000 bar |
| 25 GPa | 250,000 bar |
| 50 GPa | 500,000 bar |
| 100 GPa | 1,000,000 bar |
Reverse conversion: Bar to Gigapascal
1 bar × 0.0001 = 0.0001 GPa
1 bar = 0.0001 gigapascals.
gigapascals = bars × 0.0001
For a page dedicated to this direction, see Bar to Gigapascal.
Understanding the Gigapascal (GPa)
Gigapascal is 1000000000 pascal units.
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.
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 bars are in 1 gigapascal?
1 gigapascal equals 10,000 bars, using the exact defined conversion factor rather than an estimate.
How do I convert gigapascal to bar?
Multiply the gigapascal value by 10000. The converter above does this instantly to whatever precision you set.
How do I convert bar back to gigapascal?
Use the reverse factor: 1 bar equals 0.0001 gigapascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigapascal?
Gigapascal (GPa) is a unit of pressure.
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.
Is the gigapascal to bar 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.