Convert Torr to Atmospheres
1 torr equals 0.001315789474 atmospheres (atm).
1 Torr = 0.001315789474 atm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk torr to atmosphere converter to paste a column from Excel.
How to Convert Torr to Atmosphere
- 1 Torr = 0.001315789474 atm
- 1 atm = 760 Torr
- Example: convert 15 Torr to atm: 15 Torr = 15 × 0.001315789474 atm = 0.01973684211 atm
Formula
atm = Torr × 0.001315789473684
or atm = Torr ÷ 760
Derivation from SI units:
- 1 Torr = 101325/760 Pa = 133.3223684 Pa (1/760 of a standard atmosphere)
- 1 atm = 101 325 Pa (exact, by definition)
- 1 Torr = 133.3223684211 Pa ÷ 101325 Pa per atm = 0.001315789473684 atm
Both units are defined exactly, so the factor is exact. Torr definition: torr; Atmosphere definition: atmosphere.
Worked examples
- A reading of 0.1 Torr converts to 0.0001315789474 atm.
0.1 Torr × 0.001315789474 = 0.0001315789474 atm - A value of 100 Torr is 0.1315789474 atm.
100 Torr × 0.001315789474 = 0.1315789474 atm
Torr to Atmosphere conversion table
| Torr | Atmospheres (atm) |
|---|---|
| 0.000001 Torr | 1.315789474 × 10⁻⁹ atm |
| 0.00001 Torr | 1.315789474 × 10⁻⁸ atm |
| 0.0001 Torr | 1.315789474 × 10⁻⁷ atm |
| 0.001 Torr | 0.000001315789474 atm |
| 0.01 Torr | 0.00001315789474 atm |
| 0.1 Torr | 0.0001315789474 atm |
| 0.5 Torr | 0.0006578947368 atm |
| 1 Torr | 0.001315789474 atm |
| 5 Torr | 0.006578947368 atm |
| 10 Torr | 0.01315789474 atm |
| 50 Torr | 0.06578947368 atm |
| 100 Torr | 0.1315789474 atm |
| 250 Torr | 0.3289473684 atm |
| 500 Torr | 0.6578947368 atm |
| 750 Torr | 0.9868421053 atm |
| 760 Torr | 1 atm |
| 1000 Torr | 1.315789474 atm |
Where it's used
Torr are used for vacuum technology and vacuum gauges, while atmospheres appear in chemistry and gas laws (STP and NTP conditions). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Torr to other pressure units
| Conversion | 1 Torr equals |
|---|---|
| torr to pascal | 133.3223684 Pa |
| torr to kilopascal | 0.1333223684 kPa |
| torr to megapascal | 0.0001333223684 MPa |
| torr to psi | 0.0193367747 psi |
| torr to bar | 0.001333223684 bar |
| torr to millibar | 1.333223684 mbar |
| torr to decibar | 0.01333223684 dbar |
| torr to millimeter of mercury | 0.9999998575 mmHg |
| torr to millimeter of water | 13.59509806 mmH₂O |
| torr to centimeter of water | 1.359509806 cmH₂O |
| torr to inch of water | 0.5352400812 inH₂O |
| torr to inch of water (60 °F) | 0.5357754719 inH₂O (60 °F) |
| torr to inch of mercury | 0.03937007313 inHg |
| torr to atmosphere | 0.001315789474 atm |
| torr to barye | 1333.223684 Ba |
Frequently asked questions
How many atmospheres are in 1 torr?
1 Torr = 0.001315789474 atm.
How do I convert torr to atmospheres?
Multiply the value in Torr by 0.001315789474, or divide it by 760. For example, 15 Torr × 0.001315789474 = 0.01973684211 atm.
Is the Torr 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
- 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)".
- 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 Torr to Atmospheres. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/torr-to-atmosphere/
IEEE
Scientific Converters, "Convert Torr to Atmospheres," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/torr-to-atmosphere/