Torr to Psi
Type a value in either box to convert between torr and psi. The factor is 0.0193368.
| Torr | Psi |
|---|---|
| 1 Torr | 0.019337 psi |
| 2 Torr | 0.038674 psi |
| 3 Torr | 0.05801 psi |
| 5 Torr | 0.096684 psi |
| 10 Torr | 0.193368 psi |
| 25 Torr | 0.483419 psi |
| 50 Torr | 0.966839 psi |
| 100 Torr | 1.933677 psi |
How to use
- Enter a value in the Torr field.
- The Psi figure appears immediately — no button to press.
- Typing in the Psi field converts back to Torr the same way.
- Use the reference table for the values that come up most often.
Torr to Psi formula
The factor from torr to psi is 0.0193367747.
psi = Torr × 0.0193367747
Why this factor: the torr and the pound per square inch are both defined against the pascal, so dividing one definition by the other gives 0.0193367747 directly. Both definitions are set out in full below.
To go the other way, divide by 0.0193367747 — or use the Psi to Torr converter, which is the same calculation reversed.
Worked example
Start with 760 Torr. Multiply by 0.0193367747 to get 14.695949 psi.
760 Torr × 0.0193367747 = 14.695949 psi
The converter above does this for any value you type, in either direction.
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.
What is a pound per square inch?
Pounds per square inch is the standard pressure unit in the United States.
Definition: One pound-force per square inch, which is about 6,894.757 pascals.
Where it is used: US tire pressure, compressed air and hydraulic systems, and plumbing water pressure.
Torr vs Psi
The torr is a specialized unit while the pound per square inch is a US customary unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many psi are in a torr?
One torr equals 0.0193367747 psi.
What is the formula to convert torr to psi?
Multiply the number of torr by 0.0193367747. To reverse it, divide by 0.0193367747 instead.
How do I convert psi back to torr?
Divide by 0.0193367747, which is the same as multiplying by 51.7149326.
How many psi are in 10 torr?
10 Torr works out to 0.193368 psi.
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 torr defined?
Exactly 101,325/760 pascals, which is about 133.3224 Pa. Named after Evangelista Torricelli.