A standard atmosphere is exactly 101,325 pascals.
Atmospheres to Decipascals Converter — atm to dPa
Convert Atmosphere (atm) to Decipascal (dPa) using the exact conversion factor (1 atmosphere = 1,013,250 decipascal). See the formula, worked examples, conversion table, and common uses.
Atmospheres to Decipascals 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.
Decipascal is 0.1 pascal units.
Result = input x 101325 / 0.1.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Atmospheres to Decipascals
Atmosphere and Decipascal 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
decipascals = atmospheres × 1013250
This factor comes from each unit's defined relationship to the category's base unit: 1 atmosphere equals 101325 base units, and 1 decipascal equals 0.1 base units, so dividing one by the other gives the direct atmosphere-to-decipascal factor of 1013250.
Simple example
1 atm × 1013250 = 1,013,250 dPa
1 atmosphere = 1,013,250 decipascals.
Real-world example
35 atm × 1013250 = 35,463,750 dPa
35 atmospheres = 35,463,750 decipascals.
Conversion table
| Atmosphere (atm) | Decipascal (dPa) |
|---|---|
| 1 atm | 1,013,250 dPa |
| 5 atm | 5,066,250 dPa |
| 10 atm | 10,132,500 dPa |
| 25 atm | 25,331,250 dPa |
| 50 atm | 50,662,500 dPa |
| 100 atm | 101,325,000 dPa |
Reverse conversion: Decipascal to Atmosphere
1 dPa × 9.869233e-7 = 9.869233e-7 atm
1 decipascal = 9.869233e-7 atmospheres.
atmospheres = decipascals × 9.869233e-7
For a page dedicated to this direction, see Decipascal 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 Decipascal (dPa)
Decipascal is 0.1 pascal units.
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 decipascals are in 1 atmosphere?
1 atmosphere equals 1,013,250 decipascals, using the exact defined conversion factor rather than an estimate.
How do I convert atmosphere to decipascal?
Multiply the atmosphere value by 1013250. The converter above does this instantly to whatever precision you set.
How do I convert decipascal back to atmosphere?
Use the reverse factor: 1 decipascal equals 9.869233e-7 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 decipascal?
Decipascal (dPa) is a unit of pressure.
Is the atmosphere to decipascal 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