Convert Torr to Atmospheres
Convert Torr to Atmospheres instantly. 1 Torr (Torr) equals 0.001316 Atmospheres (atm).
Torr to Atmospheres conversion table
| Torr (Torr) | Atmospheres (atm) |
|---|---|
| 1 Torr | 0.001316 atm |
| 2 Torr | 0.002632 atm |
| 3 Torr | 0.003947 atm |
| 5 Torr | 0.006579 atm |
| 10 Torr | 0.01316 atm |
| 20 Torr | 0.02632 atm |
| 50 Torr | 0.06579 atm |
| 100 Torr | 0.1316 atm |
| 500 Torr | 0.6579 atm |
| 1,000 Torr | 1.3158 atm |
1 Torr = 0.001316 Atmospheres · multiply Torr by 0.001316
About converting Torr to Atmospheres
Torr (Torr) and Atmospheres (atm) are both units of pressure, so converting between them is a single multiplication: multiply your Torr figure by 0.001316. Ten Torr comes to 0.01316 Atmospheres, and a hundred works out at 0.1316 Atmospheres.
Rule of thumb: going from Torr to Atmospheres divides, so the figure always shrinks — it takes about 760 Torr to make a single Atmosphere. If your answer came out bigger, you have the conversion the wrong way round.
What is a Torr?
The torr is named after Evangelista Torricelli, who invented the mercury barometer and in the process produced the first sustained vacuum anyone had made. The unit fits that legacy exactly: it is very nearly the pressure of one millimetre of mercury, and it is still the working unit of vacuum technology, where gauges read in torr and in decimal fractions of it. Its most familiar relative is not in a laboratory at all — blood pressure is quoted in millimetres of mercury, essentially the same size, so a reading of 120 over 80 is a pressure measurement in all but name.
What is an Atmosphere?
The standard atmosphere is a defined reference rather than a working unit: a figure fixed by agreement at roughly what the air presses at sea level on an ordinary day. Nobody sets a gauge to it. Instead it is the yardstick other pressures are described against — divers count depth in atmospheres, chemists specify reactions at one atmosphere, and test standards quote pressures as multiples of it. Because it is a defined number rather than a measured one, the real pressure outside almost never equals exactly one atmosphere; it wanders with the weather, which is what a barometer is telling you.
To put both in perspective: a rough vacuum pump pulls down to about 0.1 torr, while the pressure 10 metres underwater is about 2 atmospheres.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Atmospheres to Torr converter, or browse all Pressure converters.
Frequently asked questions
How many Atmospheres are in one Torr?
There are 0.001316 Atmospheres in one Torr.
How do I convert Torr to Atmospheres?
Multiply the number of Torr by 0.001316. For example, 10 Torr = 0.01316 Atmospheres.
What is 100 Torr in Atmospheres?
100 Torr is equal to 0.1316 Atmospheres.
How do I convert Atmospheres to Torr?
Multiply the Atmospheres value by 760 (or divide by 0.001316).
Is this Torr to Atmospheres conversion exact?
The definition is exact — Torr and Atmospheres are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Torr?
The torr is named after Evangelista Torricelli, who invented the mercury barometer and in the process produced the first sustained vacuum anyone had made. The unit fits that legacy exactly: it is very nearly the pressure of one millimetre of mercury, and it is still the working unit of vacuum technology, where gauges read in torr and in decimal fractions of it. Its most familiar relative is not in a laboratory at all — blood pressure is quoted in millimetres of mercury, essentially the same size, so a reading of 120 over 80 is a pressure measurement in all but name.
What is an Atmosphere?
The standard atmosphere is a defined reference rather than a working unit: a figure fixed by agreement at roughly what the air presses at sea level on an ordinary day. Nobody sets a gauge to it. Instead it is the yardstick other pressures are described against — divers count depth in atmospheres, chemists specify reactions at one atmosphere, and test standards quote pressures as multiples of it. Because it is a defined number rather than a measured one, the real pressure outside almost never equals exactly one atmosphere; it wanders with the weather, which is what a barometer is telling you.