In 1 torrs there are 0.019337 pounds per square inch. Meanwhile in 1 pounds per square inch there are 51.71493 torrs. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Pounds per square inch to Torrs calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert torr to psi (pounds per square inch), use a fixed pressure ratio.
Steps
Quick example
For reverse checks, 1 psi ≈ 51.7149 torr. Small differences can happen from rounding.
To convert torr to psi, use this factor:
These values come from standard pressure definitions.
760 torr = 14.6959 psi (about 14.7 psi).
760 torr equals 1 atmosphere, which is close to average sea-level air pressure.
Multiply the pressure in torr by 0.0193368.
Formula:
psi = torr × 0.0193368
Example:
500 torr × 0.0193368 = 9.6684 psi
Multiply the pressure in psi by 51.7149.
Formula:
torr = psi × 51.7149
Example:
10 psi × 51.7149 = 517.149 torr
They are very close, but not exactly the same by strict definition.
In most lab and HVAC work, people treat torr and mmHg as equal.
A torr is a unit of pressure. It is defined as 1/760 of standard atmospheric pressure. Torr is common in vacuum work, lab setups, and pressure gauges.
Pounds per square inch (psi) measures pressure as force over area. It means how many pounds of force press on one square inch. Psi is common in tires, air tools, compressors, and many U.S. pressure systems.
Torr shows up often in vacuum and lab gear. Psi is common on many U.S. gauges and specs. Converting helps you match readings, compare ratings, and set the right target pressure.
The unit alone doesn’t tell you. You need the label:
Don’t mix psig with absolute units unless you adjust for atmospheric pressure.
1 torr = 0.0193368 psi.
This is useful for quick estimates. For rough math, many people use 0.0193 psi per torr.
1 psi = 51.7149 torr.
This helps when you need to convert common psi values into vacuum ranges.
The conversion factor is fixed, so the math is exact. Any rounding comes from how many decimals you keep. For most uses, 4 to 6 decimal places is enough.
Here are a few quick values:
The Calculate Box tool to convert torrs to pounds per square inch uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a torrs value in the box and have it instantly converted to pounds per square inch.