Convert Atmospheres to Kilopascals
1 atmosphere (atm) equals 101.325 kilopascals (kPa).
1 atm = 101.325 kPa
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk atmosphere to kilopascal converter to paste a column from Excel.
How to Convert Atmosphere to Kilopascal
- 1 atm = 101.325 kPa
- 1 kPa = 0.009869232667 atm
- Example: convert 15 atm to kPa: 15 atm = 15 × 101.325 kPa = 1519.875 kPa
Formula
kPa = atm × 101.325
Derivation from SI units:
- 1 atm = 101 325 Pa (exact, by definition)
- 1 kPa = 10³ Pa
- 1 atm = 101325 Pa ÷ 1000 Pa per kPa = 101.325 kPa
Both units are defined exactly, so the factor is exact. Atmosphere definition: atmosphere; Kilopascal definition: kilopascal.
Worked examples
- A pressure cooker at about 2 atm absolute is at 202.65 kPa.
2 atm × 101.325 = 202.65 kPa - Air at about 5500 m altitude is near 0.5 atm, or 50.6625 kPa.
0.5 atm × 101.325 = 50.6625 kPa
Atmosphere to Kilopascal conversion table
| Atmospheres (atm) | Kilopascals (kPa) |
|---|---|
| 0.001 atm | 0.101325 kPa |
| 0.01 atm | 1.01325 kPa |
| 0.1 atm | 10.1325 kPa |
| 0.25 atm | 25.33125 kPa |
| 0.5 atm | 50.6625 kPa |
| 1 atm | 101.325 kPa |
| 1.5 atm | 151.9875 kPa |
| 2 atm | 202.65 kPa |
| 2.5 atm | 253.3125 kPa |
| 3 atm | 303.975 kPa |
| 4 atm | 405.3 kPa |
| 5 atm | 506.625 kPa |
| 10 atm | 1013.25 kPa |
| 20 atm | 2026.5 kPa |
| 50 atm | 5066.25 kPa |
| 100 atm | 10132.5 kPa |
| 200 atm | 20265 kPa |
| 300 atm | 30397.5 kPa |
| 1000 atm | 101325 kPa |
Where it's used
Chemistry and physics problems in atm are converted to kPa for engineering use and for comparison with gauges and transmitters.
Atmosphere to other pressure units
| Conversion | 1 atm equals |
|---|---|
| atmosphere to pascal | 101325 Pa |
| atmosphere to kilopascal | 101.325 kPa |
| atmosphere to megapascal | 0.101325 MPa |
| atmosphere to psi | 14.69594878 psi |
| atmosphere to bar | 1.01325 bar |
| atmosphere to millibar | 1013.25 mbar |
| atmosphere to decibar | 10.1325 dbar |
| atmosphere to torr | 760 Torr |
| atmosphere to millimeter of mercury | 759.9998917 mmHg |
| atmosphere to millimeter of water | 10332.27453 mmH₂O |
| atmosphere to centimeter of water | 1033.227453 cmH₂O |
| atmosphere to inch of water | 406.7824617 inH₂O |
| atmosphere to inch of water (60 °F) | 407.1893586 inH₂O (60 °F) |
| atmosphere to inch of mercury | 29.92125558 inHg |
| atmosphere to barye | 1013250 Ba |
Frequently asked questions
Is 1 atm equal to 100 kPa?
Not quite: 1 atm = 101.325 kPa. 100 kPa is exactly 1 bar, which IUPAC has used as standard pressure for thermodynamic data since 1982.
How many kilopascals are in 1 atmosphere?
1 atm = 101.325 kPa.
How do I convert atmospheres to kilopascals?
Multiply the value in atm by 101.325. For example, 15 atm × 101.325 = 1519.875 kPa.
Is the atm to kPa conversion exact?
Yes. Both units are defined exactly, and 1 atm is exactly 101.325 kPa.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "atmosphere, standard (atm)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Atmospheres to Kilopascals. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/atmosphere-to-kilopascal/
IEEE
Scientific Converters, "Convert Atmospheres to Kilopascals," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/atmosphere-to-kilopascal/