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Free torr to atm converter for converting between torrs (Torr) and standard atmospheres (atm). Our converter provides instant, accurate pressure conversions with real-time bidirectional calculation. Perfect for scientific research, vacuum measurements, barometric pressure readings, and engineering applications. Simple, fast, and reliable pressure unit conversion.
Last updated: January 24, 2026
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Conversion Formula:
1 Torr = 1/760 atm ≈ 0.00131579 atm
1 atm = 760 Torr
Enter a value in either field to see the conversion. The calculator updates in real-time as you type. Note: 1 Torr is approximately equal to 1 mmHg (millimeter of mercury).
Conversion Result:
800.00 Torr = 1.052632 atm
Approximately 800.00 mmHg (millimeters of mercury)
Definition
1 Torr = 1/760 atm
A torr is a unit of pressure named after Evangelista Torricelli, an Italian physicist and mathematician. One torr is defined as exactly 1/760 of a standard atmosphere. It's approximately equal to 1 millimeter of mercury (mmHg) and is commonly used in vacuum measurements and barometric pressure readings.
Definition
1 atm = 760 Torr
A standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals. It represents the average atmospheric pressure at sea level. One atmosphere equals 760 Torr or 760 millimeters of mercury. It's commonly used as a reference pressure in scientific and engineering applications.
Converting 800 torrs to atmospheres:
Input
800 Torr
Result
1.0526 atm
Our torr to atm converter provides instant, accurate conversion between torrs and standard atmospheres. The conversion uses the exact relationship: 1 Torr = 1/760 atm, which means 1 atm = 760 Torr. This is an exact conversion factor with no rounding, making it precise for scientific and engineering applications.
1 Torr = 1/760 atm ≈ 0.00131579 atm1 atm = 760 TorrTo convert Torr to atm: atm = Torr ÷ 760To convert atm to Torr: Torr = atm × 760The conversion factor 1/760 comes from the definition of a torr as exactly 1/760 of a standard atmosphere. This is an exact relationship, not an approximation, making conversions precise and reliable.
An important relationship to understand is that 1 Torr is approximately equal to 1 millimeter of mercury (mmHg). While they are not exactly equal, the difference is extremely small (less than 0.0002%), making them essentially equivalent for most practical purposes.
The torr unit is named after Evangelista Torricelli, an Italian physicist and mathematician who invented the barometer in 1643. The first barometers consisted of mercury inside a vertical glass tube, which led to the natural pressure unit of millimeters of mercury (mmHg). The torr was later defined as exactly 1/760 of a standard atmosphere to provide a more precise and standardized unit.
Torr to atmosphere conversion is essential in many scientific and engineering applications. Scientists need to convert between these units when working with vacuum systems, barometric pressure measurements, and comparing pressure values from different sources or standards.
While our calculator focuses on torr to atm conversion, torr can also be converted to many other pressure units. Here are some common conversions (rounded to 6 decimal places):
Need help with other pressure conversions? Check out our pressure converter for more unit options.
Get Custom Calculator for Your PlatformResult: 800 Torr equals 1.0526 atmospheres
This conversion uses the exact relationship: 1 Torr = 1/760 atm. The result is precise with no rounding error, making it suitable for scientific and engineering applications.
760 ÷ 760
= 1.0 atm
2.5 × 760
= 1,900 Torr
500 ÷ 760
= 0.6579 atm
0.5 × 760
= 380 Torr
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