Torr to Atmospheres Converter
Enter the pressure in torr below to convert it to atmospheres.
Convert Torr to Atmospheres
Enter a value in torr (Torr) to convert to atmospheres (atm).
Torr to Standard Atmosphere Conversion Table
Table showing various torr measurements converted to atmospheres. Click any preset value or arrow to load it into the converter.
| Torr (Torr) | Atmospheres (atm) |
|---|---|
| 1 Torr | 0.0013158 atm |
| 2 Torr | 0.0026316 atm |
| 5 Torr | 0.0065789 atm |
| 10 Torr | 0.0131579 atm |
| 15 Torr | 0.0197368 atm |
| 20 Torr | 0.0263158 atm |
| 25 Torr | 0.0328947 atm |
| 30 Torr | 0.0394737 atm |
| 50 Torr | 0.0657895 atm |
| 75 Torr | 0.0986842 atm |
How to Convert Torr to Atmospheres
To convert torr to atmospheres, multiply the pressure by the following conversion ratio: 0.0013158 atmospheres/torr.
Since one torr is equal to 0.0013158 atmospheres, you can use this simple formula to convert:
The pressure in atmospheres is equal to the pressure in torr multiplied by 0.0013158.
For example, here's how to convert 760 torr to atmospheres using the formula above.
How Many Atmospheres Are in a Torr?
There are 0.0013158 atmospheres in a torr, which is why we use this value in the formula above.
Our torr to standard atmosphere calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Torr and atmospheres are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Torr?
A torr is a unit of pressure equal to 133.3223684 pascals (Pa), the base unit for pressure. 1/760 of a standard atmosphere (133.3224 Pascals). [1]
The torr is classified as a standard unit of pressure. Torr can be abbreviated as Torr; for example, 1 torr can be written as 1 Torr.
When working with torr (Torr) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, torr (Torr) are widely used across standard pressure applications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Standard Atmosphere?
A standard atmosphere is a unit of pressure equal to 101,325 pascals (Pa), the base unit for pressure. Standard sea-level atmospheric pressure defined as 101,325 Pascals. [2]
The standard atmosphere is classified as a standard unit of pressure. Atmospheres can be abbreviated as atm; for example, 1 standard atmosphere can be written as 1 atm.
When working with atmospheres (atm) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, atmospheres (atm) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within international standard workflows, engineering documentation, and technical data sheets.
When converting pressure between torr (Torr) and atmospheres (atm), keep full floating-point precision (1 Torr = 0.0013158 atm; 1 atm = 760 Torr) during intermediate calculations and round only the final standard atmosphere figure to match your instrument tolerance.
More Torr & Standard Atmosphere Conversions
Need to calculate in the opposite direction? Use our atmospheres to torr calculator to switch your starting unit immediately. You can also explore related tools such as converting atmospheres to torr, converting bars to atmospheres, or converting psi to bars.
Convert from Torr
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — Torr (Torr) to Atmospheres (atm)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Torr (mmHg) (Torr) & Standard Atmosphere (atm)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (Torr to atm)