A standard atmosphere is exactly 101,325 pascals.
Atmospheres to Kilopascals Converter — atm to kPa
Convert Atmosphere (atm) to Kilopascal (kPa) using the exact conversion factor (1 atmosphere = 101.325 kilopascal). See the formula, worked examples, conversion table, and common uses.
Atmospheres to Kilopascals 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.
Kilopascal is 1000 pascal units.
Result = input x 101325 / 1000.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Atmospheres to Kilopascals
Atmosphere and Kilopascal 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
kilopascals = atmospheres × 101.325
This factor comes from each unit's defined relationship to the category's base unit: 1 atmosphere equals 101325 base units, and 1 kilopascal equals 1000 base units, so dividing one by the other gives the direct atmosphere-to-kilopascal factor of 101.325.
Simple example
1 atm × 101.325 = 101.325 kPa
1 atmosphere = 101.325 kilopascals.
Real-world example
35 atm × 101.325 = 3,546.375 kPa
35 atmospheres = 3,546.375 kilopascals.
Conversion table
| Atmosphere (atm) | Kilopascal (kPa) |
|---|---|
| 1 atm | 101.325 kPa |
| 5 atm | 506.625 kPa |
| 10 atm | 1,013.25 kPa |
| 25 atm | 2,533.125 kPa |
| 50 atm | 5,066.25 kPa |
| 100 atm | 10,132.5 kPa |
Reverse conversion: Kilopascal to Atmosphere
101.325 kPa × 0.009869232667 = 1 atm
101.325 kilopascals = 1 atmosphere.
atmospheres = kilopascals × 0.00986923266716
For a page dedicated to this direction, see Kilopascal 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 Kilopascal (kPa)
Kilopascal is 1000 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 kilopascals are in 1 atmosphere?
1 atmosphere equals 101.325 kilopascals, using the exact defined conversion factor rather than an estimate.
How do I convert atmosphere to kilopascal?
Multiply the atmosphere value by 101.325. The converter above does this instantly to whatever precision you set.
How do I convert kilopascal back to atmosphere?
Use the reverse factor: 1 kilopascal equals 0.0098692327 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 kilopascal?
Kilopascal (kPa) is a unit of pressure.
Is the atmosphere to kilopascal 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