Convert Pascals to Atmospheres
1 pascal (Pa) equals 0.000009869232667 atmospheres (atm).
1 Pa = 0.000009869232667 atm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk pascal to atmosphere converter to paste a column from Excel.
How to Convert Pascal to Atmosphere
- 1 Pa = 0.000009869232667 atm
- 1 atm = 101325 Pa
- Example: convert 15 Pa to atm: 15 Pa = 15 × 0.000009869232667 atm = 0.00014803849 atm
Formula
atm = Pa ÷ 101325
Derivation from SI units:
- 1 Pa = 1 N/m² = 1 kg·m⁻¹·s⁻²
- 1 atm = 101 325 Pa (exact, by definition)
Both units are defined exactly, so the factor is exact. Pascal definition: pascal; Atmosphere definition: atmosphere.
Worked examples
- An absolute pressure of 200000 Pa is 1.973846533 atm.
200000 Pa × 0.000009869232667 = 1.973846533 atm - The air pressure near 5500 m altitude, about 50000 Pa, is 0.4934616334 atm.
50000 Pa × 0.000009869232667 = 0.4934616334 atm
Pascal to Atmosphere conversion table
| Pascals (Pa) | Atmospheres (atm) |
|---|---|
| 1 Pa | 0.000009869232667 atm |
| 5 Pa | 0.00004934616334 atm |
| 10 Pa | 0.00009869232667 atm |
| 15 Pa | 0.00014803849 atm |
| 25 Pa | 0.0002467308167 atm |
| 50 Pa | 0.0004934616334 atm |
| 75 Pa | 0.00074019245 atm |
| 100 Pa | 0.0009869232667 atm |
| 125 Pa | 0.001233654083 atm |
| 150 Pa | 0.0014803849 atm |
| 200 Pa | 0.001973846533 atm |
| 250 Pa | 0.002467308167 atm |
| 300 Pa | 0.0029607698 atm |
| 400 Pa | 0.003947693067 atm |
| 500 Pa | 0.004934616334 atm |
| 750 Pa | 0.0074019245 atm |
| 1000 Pa | 0.009869232667 atm |
| 1500 Pa | 0.014803849 atm |
| 2000 Pa | 0.01973846533 atm |
| 2500 Pa | 0.02467308167 atm |
| 5000 Pa | 0.04934616334 atm |
| 10000 Pa | 0.09869232667 atm |
| 50000 Pa | 0.4934616334 atm |
| 101325 Pa | 1 atm |
Where it's used
Chemistry and gas-law calculations often use atmospheres, while SI work uses pascals. Expressing absolute pressures in atm shows them as multiples of sea-level pressure.
Pascal to other pressure units
| Conversion | 1 Pa equals |
|---|---|
| pascal to kilopascal | 0.001 kPa |
| pascal to megapascal | 0.000001 MPa |
| pascal to psi | 0.0001450377377 psi |
| pascal to bar | 0.00001 bar |
| pascal to millibar | 0.01 mbar |
| pascal to decibar | 0.0001 dbar |
| pascal to torr | 0.007500616827 Torr |
| pascal to millimeter of mercury | 0.007500615758 mmHg |
| pascal to millimeter of water | 0.1019716213 mmH₂O |
| pascal to centimeter of water | 0.01019716213 cmH₂O |
| pascal to inch of water | 0.00401463076 inH₂O |
| pascal to inch of water (60 °F) | 0.00401864652 inH₂O (60 °F) |
| pascal to inch of mercury | 0.000295299833 inHg |
| pascal to atmosphere | 0.000009869232667 atm |
| pascal to barye | 10 Ba |
Frequently asked questions
Is 1 atm exactly 101325 Pa?
Yes. The standard atmosphere is defined as exactly 101 325 Pa, so 1 Pa = 0.000009869232667 atm.
How many atmospheres are in 1 pascal?
1 Pa = 0.000009869232667 atm.
How do I convert pascals to atmospheres?
Multiply the value in Pa by 0.000009869232667, or divide it by 101325. For example, 15 Pa × 0.000009869232667 = 0.00014803849 atm.
Is the Pa to atm conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
- 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)".
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 Pascals to Atmospheres. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/pascal-to-atmosphere/
IEEE
Scientific Converters, "Convert Pascals to Atmospheres," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/pascal-to-atmosphere/