How many torr are in one atmosphere?

One standard atmosphere (1 atm) equals exactly 760 Torr. This relationship is part of the original definition of the standard atmosphere and is exact by definition.

How do I convert torr to atmospheres manually?

Divide the torr value by 760. For example, 380 Torr ÷ 760 = 0.5 atm.

What is a torr and where is it used?

The torr is a unit of pressure named after Evangelista Torricelli, who invented the mercury barometer. It is widely used in vacuum science, gas chromatography, mass spectrometry, and physics. 1 Torr is defined as exactly 1/760 of a standard atmosphere, which is approximately 133.322 Pa.

Is torr the same as mmHg?

Nearly, but not exactly. One Torr is defined as exactly 1/760 atm, while 1 mmHg is based on the physical pressure exerted by one millimeter of mercury. The difference is about 0.000014%, so they are used interchangeably in most practical applications.

What is standard atmospheric pressure in torr?

Standard atmospheric pressure is exactly 760 Torr (equivalent to 101,325 Pa or 14.696 psi). This is the reference point used to define the torr unit.

Can I convert partial torr values like 380 torr?

Yes. Divide any torr value — including decimals — by 760. So 380 Torr ÷ 760 = 0.5 atm.

Torr to Atmospheres Converter

Enter a pressure in torr and get the standard atmosphere equivalent instantly — includes reverse conversion and a reference table.

Converter

Pressure in torr

Result in atmospheres (atm)

Reverse: atmospheres to torr

Pressure in atmospheres (atm)

Result in torr

Reference Table

Torr Atmospheres (atm)

0.76 Torr 0.001 atm

7.6 Torr 0.01 atm

76 Torr 0.1 atm

380 Torr 0.5 atm

760 Torr 1 atm

1,520 Torr 2 atm

3,800 Torr 5 atm

7,600 Torr 10 atm

38,000 Torr 50 atm

76,000 Torr 100 atm

760,000 Torr 1,000 atm

Summary

This converter turns any torr value into standard atmospheres (atm) in real time using the exact factor 1 atm = 760 Torr as defined by international standards. The torr is named after Evangelista Torricelli and is widely used in vacuum science, gas chromatography, and physics. All computation runs in your browser with no server round-trips. A reverse field lets you go from atm back to torr, and a reference table covers common pressures from vacuum work to high-pressure applications.

How it works

Enter the pressure value in torr in the top input field.
The converter divides your value by 760 to get atmospheres.
The result updates instantly as you type.
Use the reverse field to convert atmospheres back to torr.
Click "Copy" next to any result to copy it to the clipboard.
Check the reference table for common torr-to-atm values.

Use cases

Convert vacuum system readings from torr to atm for comparison with atmospheric data.
Translate gas chromatography pressures from torr to atm for lab reports.
Express partial pressures in atm for thermodynamic calculations.
Convert boiling point pressure values from torr to atm in chemistry problems.
Verify pump specifications listed in torr against standard atmosphere benchmarks.
Cross-check pressure readings that mix torr and atm units in scientific literature.

Frequently Asked Questions

Last updated: 2026-06-19 · Reviewed by Nham Vu