Convert Atmospheres to Torr
1 atmosphere (atm) equals 760 torr.
1 atm = 760 Torr
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk atmosphere to torr converter to paste a column from Excel.
How to Convert Atmosphere to Torr
- 1 atm = 760 Torr
- 1 Torr = 0.001315789474 atm
- Example: convert 15 atm to Torr: 15 atm = 15 × 760 Torr = 11400 Torr
Formula
Torr = atm × 760
Derivation from SI units:
- 1 atm = 101 325 Pa (exact, by definition)
- 1 Torr = 101325/760 Pa = 133.3223684 Pa (1/760 of a standard atmosphere)
- 1 atm = 101325 Pa ÷ 133.3223684211 Pa per Torr = 760 Torr
Both units are defined exactly, so the factor is exact. Atmosphere definition: atmosphere; Torr definition: torr.
Worked examples
- A reading of 1.5 atm converts to 1140 Torr.
1.5 atm × 760 = 1140 Torr - A value of 10 atm is 7600 Torr.
10 atm × 760 = 7600 Torr
Atmosphere to Torr conversion table
| Atmospheres (atm) | Torr |
|---|---|
| 0.001 atm | 0.76 Torr |
| 0.01 atm | 7.6 Torr |
| 0.1 atm | 76 Torr |
| 0.25 atm | 190 Torr |
| 0.5 atm | 380 Torr |
| 1 atm | 760 Torr |
| 1.5 atm | 1140 Torr |
| 2 atm | 1520 Torr |
| 2.5 atm | 1900 Torr |
| 3 atm | 2280 Torr |
| 4 atm | 3040 Torr |
| 5 atm | 3800 Torr |
| 10 atm | 7600 Torr |
| 20 atm | 15200 Torr |
| 50 atm | 38000 Torr |
| 100 atm | 76000 Torr |
| 200 atm | 152000 Torr |
| 300 atm | 228000 Torr |
| 1000 atm | 760000 Torr |
Where it's used
Atmospheres are used for chemistry and gas laws (STP and NTP conditions), while torr appear in vacuum technology and vacuum gauges. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
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
How many torr are in 1 atmosphere?
1 atm = 760 Torr.
How do I convert atmospheres to torr?
Multiply the value in atm by 760. For example, 15 atm × 760 = 11400 Torr.
Is the atm to Torr 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, "torr (Torr)".
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 Torr. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/atmosphere-to-torr/
IEEE
Scientific Converters, "Convert Atmospheres to Torr," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/atmosphere-to-torr/