Convert inches of mercury to kilopascals

1 inHg=3.38639kPa

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

You have

Equals

3.386389

Conversion formula

Forward

kilopascals = inches of mercury × 3.38639

Reverse

inches of mercury = kilopascals × 0.2953

Example: 10 inHg × 3.38639 = 33.8639 kPa.

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 →

Kilopascal

kPa

The kilopascal equals 1000 pascals. Used for tyre pressures in many metric countries, engineering pressures and weather reports. 100 kPa ≈ 1 bar ≈ atmospheric pressure.

Real-world: Tyre pressure: 220–280 kPa. Atmospheric: 101 kPa. HVAC duct static: 0.1–0.3 kPa.

Read full kilopascal reference →

Inch of Mercury to Kilopascal conversion table

Common inches of mercury to kilopascals values for quick reference.

Inch of Mercury (inHg)	Kilopascal (kPa)
1 inHg	3.38639 kPa
5 inHg	16.9319 kPa
10 inHg	33.8639 kPa
25 inHg	84.6597 kPa
50 inHg	169.319 kPa
100 inHg	338.639 kPa
200 inHg	677.278 kPa
500 inHg	1,693.19 kPa
1,000 inHg	3,386.39 kPa
5,000 inHg	16,931.95 kPa

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 kilopascals in a inch of mercury?

One inch of mercury equals 3.38639 kilopascals.

How do I convert inches of mercury to kilopascals?

Multiply the inch of mercury value by 3.38639 to get the equivalent in kilopascals.

What is 100 inches of mercury in kilopascals?

100 inches of mercury equals 338.639 kilopascals.

Is a inch of mercury bigger than a kilopascal?

Yes. 1 inch of mercury equals 3.38639 kilopascals, so one inch of mercury is larger.

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

Multiply by 3.39 for a quick estimate; use a calculator for precise results.

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