A torr is 1/760 standard atmosphere.
Torrs to PSI Converter — Torr to psi
Convert Torr (Torr) to PSI (psi) using the exact conversion factor (1 torr = 0.0193367747 psi). See the formula, worked examples, conversion table, history, and common uses.
Torrs to PSI converter
Converter
Pressure Converter
Convert pascals, bars, PSI, atmospheres, mercury columns, water columns, and engineering pressure units.
Context values
Some unit families need one extra value for a physically accurate result.
Pounds per square inch.
Result = input x 133.3223684 / 6894.757293.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Torrs to PSI
Torr and PSI both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Specifically: A torr is 1/760 standard atmosphere, and pounds per square inch.
Formula
psi = torrs × 0.0193367747046
This factor comes from each unit's defined relationship to the category's base unit: 1 torr equals 133.322368421 base units, and 1 psi equals 6894.75729317 base units, so dividing one by the other gives the direct torr-to-psi factor of 0.0193367747046.
Simple example
1 Torr × 0.0193367747 = 0.0193367747 psi
1 torr = 0.0193367747 psi.
Real-world example
35 Torr × 0.0193367747 = 0.6767871147 psi
35 torrs = 0.6767871147 psi.
Conversion table
| Torr (Torr) | PSI (psi) |
|---|---|
| 1 Torr | 0.0193367747 psi |
| 5 Torr | 0.0966838735 psi |
| 10 Torr | 0.193367747 psi |
| 25 Torr | 0.4834193676 psi |
| 50 Torr | 0.9668387352 psi |
| 100 Torr | 1.93367747 psi |
Reverse conversion: PSI to Torr
0.0193367747 psi × 51.71493257 = 0.9999999998 Torr
0.0193367747 psi = 0.9999999998 torrs.
torrs = psi × 51.7149325715
For a page dedicated to this direction, see PSI to Torr.
Understanding the Torr (Torr)
A torr is 1/760 standard atmosphere.
Understanding the PSI
PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.
Where it's used: United States (standard pressure unit for tires, tools, and plumbing)
Uses of the PSI today
- Tire pressure specifications in the US
- Hydraulic and pneumatic system ratings
- Plumbing, compressed-air tools, and industrial equipment ratings
History of the PSI
PSI is a derived unit from the pound-force and the inch, both themselves standardized through English and later international agreements rather than invented as a pressure unit from scratch.
It became the default pressure unit in US engineering as pound-force and inch-based measurement dominated American industry through the 19th and 20th centuries, and it remains in everyday use for tires and tools even as most other measurements in the US context stay imperial.
Historical origin. PSI was not the invention of a single named person; it developed through the process described above.
PSI — sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units — Documents conversion factors for psi and other US customary pressure units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many psi are in 1 torr?
1 torr equals 0.0193367747 psi, using the exact defined conversion factor rather than an estimate.
How do I convert torr to psi?
Multiply the torr value by 0.0193367747. The converter above does this instantly to whatever precision you set.
How do I convert psi back to torr?
Use the reverse factor: 1 psi equals 51.71493257 torrs. You can also use the swap control in the converter above to flip the direction instantly.
What is a torr?
Torr (Torr) is a unit of pressure.
What is a psi?
PSI (psi) measures pressure. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. It is classified as a US/imperial customary unit.
Is the torr to psi conversion exact?
Yes. PSI (pounds-force per square inch) equals exactly 6,894.757293168 pascals. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.