How many Torr is 1 psi?

1 psi equals approximately 51.7149 Torr. This is derived from the definition of 1 standard atmosphere = 101,325 Pa = 760 Torr and 1 psi = 6,894.757 Pa.

How do I convert psi to Torr manually?

Multiply the psi value by 51.71492. For example, 14.696 psi × 51.71492 ≈ 760 Torr, which is standard atmospheric pressure.

What is standard atmospheric pressure in Torr?

Standard atmospheric pressure is 14.696 psi, which equals exactly 760 Torr. The Torr unit was originally defined as 1 millimeter of mercury (mmHg) at 0°C and standard gravity.

What is the difference between Torr and mmHg?

Torr and mmHg are very nearly equal but not exactly the same. 1 Torr is defined as 1/760 of standard atmospheric pressure (101,325 Pa), while 1 mmHg is based on the physical height of a mercury column. The difference is less than 0.000016%.

When is Torr used instead of psi?

Torr is commonly used in vacuum technology, semiconductor manufacturing, medical equipment, and scientific research where low pressures need to be expressed. PSI is more common in industrial, automotive, and everyday applications in the United States.

What is 0 psi in Torr?

0 psi equals 0 Torr — both indicate zero absolute pressure (perfect vacuum). However, gauge pressures in psi are measured relative to atmospheric pressure, so 0 psi gauge = 760 Torr absolute at sea level.

PSI to Torr Converter

Enter a pressure in PSI and get the Torr equivalent instantly — reverse Torr-to-PSI conversion included.

Converter

Pressure in PSI

Result in Torr

Reverse: Torr to PSI

Pressure in Torr

Result in PSI

Reference Table

PSI Torr

0.01 psi 0.5171

0.1 psi 5.171

1 psi 51.71

5 psi 258.6

10 psi 517.1

14.696 psi (1 atm) 760.0

15 psi 775.7

20 psi 1,034

30 psi 1,551

50 psi 2,586

100 psi 5,171

1,000 psi 51,715

Summary

This converter turns any PSI value into Torr in real time using the exact conversion factor of 1 psi = 51.71492 Torr (derived from the defined values of standard atmosphere and mmHg). All math runs in your browser with no server call. A built-in reverse field lets you convert Torr back to PSI, and a reference table covers the most common pressure values.

How it works

Enter the pressure value in PSI in the top input field.
The Torr result appears instantly as you type.
Use the reverse field to convert Torr back to PSI.
Click "Copy" next to any result to copy it to your clipboard.
Check the reference table for common PSI-to-Torr values.

Use cases

Convert vacuum system pressures from psi to Torr for laboratory equipment.
Translate medical gas pressures from psi to Torr for blood pressure references.
Convert meteorological pressure readings between psi and Torr.
Check semiconductor process chamber pressures against psi gauge readings.
Verify vacuum pump specifications listed in psi against Torr datasheets.
Convert barometric pressure values from psi to Torr for scientific instruments.

Frequently Asked Questions

Last updated: 2026-06-18 · Reviewed by Nham Vu