A standard atmosphere is exactly 101,325 pascals.
Atmospheres to Technical atmospheres Converter — atm to at
Convert Atmosphere (atm) to Technical atmosphere (at) using the exact conversion factor (1 atmosphere = 1.033227453 technical atmosphere). See the formula, worked examples, conversion table, and common uses.
Atmospheres to Technical atmospheres 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.
Technical atmosphere is kilogram-force per square centimeter.
Result = input x 101325 / 98066.5.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Atmospheres to Technical atmospheres
Atmosphere and Technical atmosphere 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. Atmosphere is most often used for chemistry (standard conditions are often defined at 1 atm).
Formula
technical atmospheres = atmospheres × 1.0332274528
This factor comes from each unit's defined relationship to the category's base unit: 1 atmosphere equals 101325 base units, and 1 technical atmosphere equals 98066.5 base units, so dividing one by the other gives the direct atmosphere-to-technical atmosphere factor of 1.0332274528.
Simple example
1 atm × 1.033227453 = 1.033227453 at
1 atmosphere = 1.033227453 technical atmospheres.
Real-world example
35 atm × 1.033227453 = 36.16296085 at
35 atmospheres = 36.16296085 technical atmospheres.
Conversion table
| Atmosphere (atm) | Technical atmosphere (at) |
|---|---|
| 1 atm | 1.033227453 at |
| 5 atm | 5.166137264 at |
| 10 atm | 10.33227453 at |
| 25 atm | 25.83068632 at |
| 50 atm | 51.66137264 at |
| 100 atm | 103.3227453 at |
Reverse conversion: Technical atmosphere to Atmosphere
1.033227453 at × 0.9678411054 = 1 atm
1.033227453 technical atmospheres = 1 atmospheres.
atmospheres = technical atmospheres × 0.967841105354
For a page dedicated to this direction, see Technical atmosphere to Atmosphere.
Understanding the Atmosphere
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
Where it's used: Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar
Uses of the Atmosphere today
- Chemistry (standard conditions are often defined at 1 atm)
- Diving and aviation pressure references
- General reference for everyday atmospheric pressure
Understanding the Technical atmosphere (at)
Technical atmosphere is kilogram-force per square centimeter.
Atmosphere — sources
- BIPM SI Brochure — Standard atmosphere listed among non-SI units with a fixed exact value in pascals.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many technical atmospheres are in 1 atmosphere?
1 atmosphere equals 1.033227453 technical atmospheres, using the exact defined conversion factor rather than an estimate.
How do I convert atmosphere to technical atmosphere?
Multiply the atmosphere value by 1.033227453. The converter above does this instantly to whatever precision you set.
How do I convert technical atmosphere back to atmosphere?
Use the reverse factor: 1 technical atmosphere equals 0.9678411054 atmospheres. You can also use the swap control in the converter above to flip the direction instantly.
What is a atmosphere?
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
What is a technical atmosphere?
Technical atmosphere (at) is a unit of pressure.
Is the atmosphere to technical atmosphere conversion exact?
Yes. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. 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 atmosphere still used today?
Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar