How many Torr are in one inHg?

1 inch of mercury (inHg) equals 25.4 Torr. This comes from the fact that 1 inch equals exactly 25.4 millimeters, and 1 mmHg ≈ 1 Torr (they differ by only 0.000014%).

How do I convert inHg to Torr manually?

Multiply the inHg value by 25.4. For example, 2 inHg × 25.4 = 50.8 Torr. To go the other way, divide the Torr value by 25.4.

What is inHg and where is it used?

Inches of mercury (inHg) is a unit of pressure based on the height of a mercury column. It is widely used in meteorology (barometric pressure), aviation altimeters, and HVAC systems, especially in the United States.

What is a Torr and how does it relate to mmHg?

The Torr is named after Evangelista Torricelli and is defined as exactly 1/760 of a standard atmosphere (≈ 133.322 Pa). The millimeter of mercury (mmHg) is based on the physical pressure of a 1 mm mercury column (≈ 133.322 Pa as well). They are nearly identical — differing by only 0.000014% — so 1 Torr ≈ 1 mmHg for all practical purposes.

What is standard atmospheric pressure in inHg and Torr?

Standard atmospheric pressure is 29.9213 inHg, which equals 760 Torr (or 760 mmHg). This is also 1 atm = 101,325 Pa = 14.696 psi.

Can I convert decimal inHg values like 29.92 inHg?

Yes. Multiply any inHg value by 25.4. So 29.92 inHg × 25.4 = 759.97 Torr, which is effectively standard atmospheric pressure (760 Torr).

inHg to Torr Converter

Name: inHg to Torr Converter
Availability: InStock
Author: Nham Vu

Enter a pressure in inches of mercury (inHg) and get the Torr equivalent instantly — includes reverse conversion and a reference table.

Converter

Pressure in inches of mercury (inHg)

Result in Torr

Reverse: Torr to inHg

Pressure in Torr

Result in inHg

Reference Table

inHg Torr

0.1 inHg 2.54 Torr

0.5 inHg 12.7 Torr

1 inHg 25.4 Torr

5 inHg 127 Torr

10 inHg 254 Torr

14.696 inHg 373.28 Torr

20 inHg 508 Torr

25 inHg 635 Torr

29.92 inHg 760 Torr (1 atm)

30 inHg 762 Torr

40 inHg 1,016 Torr

Summary

Enter a pressure in inches of mercury (inHg) and get the Torr equivalent instantly — includes reverse conversion and a reference table.

How it works

Enter the pressure value in inches of mercury (inHg) in the top input field.
The converter multiplies your value by 25.4 to get Torr.
The result updates instantly as you type.
Use the reverse field to convert Torr back to inHg.
Click "Copy" next to any result to copy it to the clipboard.
Check the reference table for common inHg-to-Torr values.

Use cases

Convert barometric pressure readings from weather stations given in inHg to Torr.
Translate vacuum system specifications from inHg to Torr for lab equipment.
Express blood pressure or physiological pressure data in Torr from inHg readings.
Cross-check pressure values in scientific literature that mix inHg and Torr units.
Convert HVAC system pressure readings from inHg to Torr for calculations.
Verify barometric pressure for altitude or aviation applications in Torr units.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu