Technical atmosphere is kilogram-force per square centimeter.
Technical atmospheres to Bars Converter — at to bar
Convert Technical atmosphere (at) to Bar (bar) using the exact conversion factor (1 technical atmosphere = 0.980665 bar). See the formula, worked examples, conversion table, history, and common uses.
Technical atmospheres 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 98066.5 / 100000.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Technical atmospheres to Bars
Technical atmosphere 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: Technical atmosphere is kilogram-force per square centimeter, and a bar is exactly 100,000 pascals.
Formula
bars = technical atmospheres × 0.980665
This factor comes from each unit's defined relationship to the category's base unit: 1 technical atmosphere equals 98066.5 base units, and 1 bar equals 100000 base units, so dividing one by the other gives the direct technical atmosphere-to-bar factor of 0.980665.
Simple example
1 at × 0.980665 = 0.980665 bar
1 technical atmosphere = 0.980665 bars.
Real-world example
35 at × 0.980665 = 34.323275 bar
35 technical atmospheres = 34.323275 bars.
Conversion table
| Technical atmosphere (at) | Bar (bar) |
|---|---|
| 1 at | 0.980665 bar |
| 5 at | 4.903325 bar |
| 10 at | 9.80665 bar |
| 25 at | 24.516625 bar |
| 50 at | 49.03325 bar |
| 100 at | 98.0665 bar |
Reverse conversion: Bar to Technical atmosphere
0.980665 bar × 1.019716213 = 1 at
0.980665 bars = 1 technical atmosphere.
technical atmospheres = bars × 1.01971621298
For a page dedicated to this direction, see Bar to Technical atmosphere.
Understanding the Technical atmosphere (at)
Technical atmosphere is kilogram-force per square centimeter.
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 technical atmosphere?
1 technical atmosphere equals 0.980665 bars, using the exact defined conversion factor rather than an estimate.
How do I convert technical atmosphere to bar?
Multiply the technical atmosphere value by 0.980665. The converter above does this instantly to whatever precision you set.
How do I convert bar back to technical atmosphere?
Use the reverse factor: 1 bar equals 1.019716213 technical atmospheres. You can also use the swap control in the converter above to flip the direction instantly.
What is a technical atmosphere?
Technical atmosphere (at) 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 technical atmosphere 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.