Convert inches of mercury to torr

1 inHg=25.4Torr

Use the converter below to change any inches of mercury value into torr instantly — with formula, conversion table, and real-world examples.

You have

Equals

25.40001

Conversion formula

Forward

torr = inches of mercury × 25.4

Reverse

inches of mercury = torr × 0.03937

Example: 10 inHg × 25.4 = 254 Torr.

About both units

From

Inch of Mercury

inHg

The inch of mercury equals about 3386 Pa. Used in US barometers, US aviation altimeter settings and some engineering. Standard sea-level pressure: 29.92 inHg.

Real-world: Sea-level standard: 29.92 inHg. Mountain pass at 3000 m: ~21 inHg. US aviation QNH given in inHg.

Read full inch of mercury reference →

Torr

The torr equals 1/760 atm — approximately 133.32 Pa. Essentially equivalent to mmHg but defined slightly differently. Used in vacuum-system engineering and older physics.

Real-world: Low-vacuum: 760 to 25 torr. High-vacuum: 10⁻³ to 10⁻⁹ torr. Semiconductor fabrication: often below 10⁻⁶ torr.

Read full torr reference →

Inch of Mercury to Torr conversion table

Common inches of mercury to torr values for quick reference.

Inch of Mercury (inHg)	Torr (Torr)
1 inHg	25.4 Torr
5 inHg	127 Torr
10 inHg	254 Torr
25 inHg	635 Torr
50 inHg	1,270 Torr
100 inHg	2,540 Torr
200 inHg	5,080 Torr
500 inHg	12,700 Torr
1,000 inHg	25,400.01 Torr
5,000 inHg	127,000.03 Torr

Tips & common mistakes

Quick tips

1 inHg ≈ 3386 Pa ≈ 33.86 mbar.
29.92 inHg = 1013.25 mbar = 1 atm.
US pilots use inHg; European pilots use hPa (mbar).

Avoid these

Confusing inHg with mmHg — factor of 25.4.
Mixing US and European altimeter units on a single flight plan.
Using inHg on scientific papers — prefer Pa.

Frequently asked questions

How many torr in a inch of mercury?

One inch of mercury equals 25.4 torr.

How do I convert inches of mercury to torr?

Multiply the inch of mercury value by 25.4 to get the equivalent in torr.

What is 100 inches of mercury in torr?

100 inches of mercury equals 2,540 torr.

Is a inch of mercury bigger than a torr?

Yes. 1 inch of mercury equals 25.4 torr, so one inch of mercury is larger.

How to convert inches of mercury to torr without a calculator?

Multiply by 25.4 for a quick estimate; use a calculator for precise results.

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