Atmospheres to Torr
An instant atmospheres-to-torr converter, with the formula and a reference table below.
| Atmospheres | Torr |
|---|---|
| 1 atm | 760 Torr |
| 2 atm | 1520 Torr |
| 3 atm | 2280 Torr |
| 5 atm | 3800 Torr |
| 10 atm | 7600 Torr |
| 25 atm | 19000 Torr |
| 50 atm | 38000 Torr |
| 100 atm | 76000 Torr |
How to use
- Enter a value in the Atmospheres field.
- The Torr figure appears immediately — no button to press.
- Typing in the Torr field converts back to Atmospheres the same way.
- Use the reference table for the values that come up most often.
Atmospheres to Torr formula
Converting atmospheres to torr is a single multiplication by 760.
Torr = atm × 760
Put another way, one atmosphere is exactly 760 torr.
Why this factor: the atmosphere and the torr are both defined against the pascal, so dividing one definition by the other gives 760 directly. Both definitions are set out in full below.
To go the other way, divide by 760 — or use the Torr to Atmospheres converter, which is the same calculation reversed.
Worked example
Start with 32 atm. Multiply by 760 to get 24320 Torr.
32 atm × 760 = 24320 Torr
The converter above does this for any value you type, in either direction.
What is an atmosphere?
A standard atmosphere is a fixed reference pressure, originally average sea-level air pressure.
Definition: Defined as exactly 101,325 pascals — an exact convention, not a measurement.
Where it is used: Chemistry reference conditions, diving pressure, and high-pressure physics.
What is a torr?
A torr is a vacuum-measurement pressure unit, defined as one 760th of a standard atmosphere.
Definition: Exactly 101,325/760 pascals, which is about 133.3224 Pa. Named after Evangelista Torricelli.
Where it is used: Vacuum systems, mass spectrometry, and semiconductor process chambers.
Worth knowing: Almost identical to the mmHg but not exactly equal — they differ by about one part in seven million, which matters only in precision metrology.
Atmospheres vs Torr
The atmosphere and the torr belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many torr are in an atmosphere?
One atmosphere equals 760 torr.
What is the formula to convert atmospheres to torr?
Multiply the number of atmospheres by 760. To reverse it, divide by 760 instead.
How do I convert torr back to atmospheres?
Divide by 760, which is the same as multiplying by 0.00131578947.
How many torr are in 10 atmospheres?
10 atm works out to 7600 Torr.
Is there anything to watch out for with torr?
Almost identical to the mmHg but not exactly equal — they differ by about one part in seven million, which matters only in precision metrology.
How is the atmosphere defined?
Defined as exactly 101,325 pascals — an exact convention, not a measurement.