In 1 torrs there are 0.001316 atmospheres. Meanwhile in 1 atmospheres there are 760 torrs. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Atmospheres to Torrs calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert torr to atmospheres (atm), use a fixed pressure conversion factor.
Example:
This torr-to-atm conversion works the same every time, since the factor is constant.
To convert torr to atmospheres, divide the torr value by 760.
Formula: atm = torr ÷ 760
Example: 380 torr ÷ 760 = 0.5 atm
There are 760 torr in 1 atm.
This is the standard reference used in most pressure conversions.
They’re very close, but not exactly the same.
In most lab and classroom work, 1 torr is treated as 1 mmHg because the difference is tiny. For high-precision work, use defined unit conversions instead of rounding.
Because standard atmospheric pressure is defined as 1 atm, and it equals 760 torr. That link makes the math direct and consistent.
To convert atmospheres to torr, multiply by 760.
Formula: torr = atm × 760
Example: 0.75 atm × 760 = 570 torr
1 torr = 1/760 atm, which is about 0.00131579 atm.
Use atm = torr ÷ 760.100 ÷ 760 = 0.1315789 atm
So, 100 torr ≈ 0.1316 atm.
500 ÷ 760 = 0.6578947 atm
So, 500 torr ≈ 0.6579 atm.
760 ÷ 760 = 1 atm
So, 760 torr = 1 atm exactly.
Torr is common in vacuum work, gas pressure readings, and some lab equipment. Atmospheres (atm) are often used in chemistry problems and gas law formulas. Both describe pressure, just in different units.
No. The unit conversion between torr and atm does not change with temperature. Only the pressure you measure can change with temperature, depending on the system.
A quick estimate is to divide by 760 using easy benchmarks:
The Calculate Box tool to convert torrs to atmospheres uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a torrs value in the box and have it instantly converted to atmospheres.