Convert Atmospheres to psi
1 atmosphere (atm) equals 14.69594878 psi.
1 atm = 14.69594878 psi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk atmosphere to psi converter to paste a column from Excel.
How to Convert Atmosphere to psi
- 1 atm = 14.69594878 psi
- 1 psi = 0.06804596391 atm
- Example: convert 15 atm to psi: 15 atm = 15 × 14.69594878 psi = 220.4392316 psi
Formula
psi = atm × 14.69594877551
Derivation from SI units:
- 1 atm = 101 325 Pa (exact, by definition)
- 1 psi = 1 lbf/in² = (0.45359237 kg × 9.80665 m/s²) ÷ (0.0254 m)² = 6894.757293168 Pa
- 1 atm = 101325 Pa ÷ 6894.757293168 Pa per psi = 14.69594877551 psi
Both units are defined exactly, so the factor is exact. Atmosphere definition: atmosphere; psi definition: psi.
Worked examples
- 1 atm equals 14.69594878 psi.
1 atm × 14.69594878 = 14.69594878 psi - A pressure vessel at 2.5 atm absolute is at 36.73987194 psi.
2.5 atm × 14.69594878 = 36.73987194 psi
Atmosphere to psi conversion table
| Atmospheres (atm) | psi |
|---|---|
| 0.001 atm | 0.01469594878 psi |
| 0.01 atm | 0.1469594878 psi |
| 0.1 atm | 1.469594878 psi |
| 0.25 atm | 3.673987194 psi |
| 0.5 atm | 7.347974388 psi |
| 1 atm | 14.69594878 psi |
| 1.5 atm | 22.04392316 psi |
| 2 atm | 29.39189755 psi |
| 2.5 atm | 36.73987194 psi |
| 3 atm | 44.08784633 psi |
| 4 atm | 58.7837951 psi |
| 5 atm | 73.47974388 psi |
| 10 atm | 146.9594878 psi |
| 20 atm | 293.9189755 psi |
| 50 atm | 734.7974388 psi |
| 100 atm | 1469.594878 psi |
| 200 atm | 2939.189755 psi |
| 300 atm | 4408.784633 psi |
| 1000 atm | 14695.94878 psi |
Where it's used
Gas-law and scuba calculations often give results in atm, while US equipment needs psi. Multiply by about 14.7.
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 exactly 14.7 psi?
Approximately: 1 atm = 14.69594878 psi.
How many psi are in 1 atmosphere?
1 atm = 14.69594878 psi.
How do I convert atmospheres to psi?
Multiply the value in atm by 14.69594878. For example, 15 atm × 14.69594878 = 220.4392316 psi.
Is the atm to psi 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
- 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)".
- 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, "pound-force per square inch (psi)".
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 psi. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/atmosphere-to-psi/
IEEE
Scientific Converters, "Convert Atmospheres to psi," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/atmosphere-to-psi/