The inch of mercury
The inch of mercury (inHg) equals 3,386.389 Pa under the NIST SP 811 conventional definition. It is the standard unit for barometric pressure on US weather reports and for altimeter settings in US aviation.
Inches of mercury to Kilopascals Converter
1 inHg = 3.38639 kPa (inch of mercury → kilopascal)
1 inHg = 3.38639 kPa
1 inch of mercury equals 3.38639 kilopascals. To convert inches of mercury to kilopascals, multiply the inch of mercury value by 3.38639. For quick reference: 1 inHg = 3.38639 kPa, 5 inHg = 16.9319 kPa, 10 inHg = 33.8639 kPa, 100 inHg = 338.639 kPa.
Formula
Kilopascals = Inches of mercury × 3.38639Quick
How to convert inches of mercury to kilopascals
Take your value
Start with your value in inches of mercury.
Multiply by 3.38639
Multiply the inch of mercury value by 3.38639. This is the exact conversion factor from inches of mercury to kilopascals.
Read the result
The product is your value in kilopascals. For example, 5 inHg × 3.38639 = 16.9319 kPa.
Conversion formula
The exact factor from inches of mercury to kilopascals is 3.38639.
Kilopascals = Inches of mercury × 3.38639
Inches of mercury to Kilopascals conversion table
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Inches of mercury (inHg) | Kilopascals (kPa) |
|---|---|
| 0.001 inHg | 0.0033864 kPa |
| 0.01 inHg | 0.033864 kPa |
| 0.1 inHg | 0.33864 kPa |
| 0.5 inHg | 1.6932 kPa |
| 1 inHg | 3.3864 kPa |
| 1.5 inHg | 5.0796 kPa |
| 2 inHg | 6.7728 kPa |
| 2.5 inHg | 8.466 kPa |
| 3 inHg | 10.159 kPa |
| 4 inHg | 13.546 kPa |
| 5 inHg | 16.932 kPa |
| 6 inHg | 20.318 kPa |
| 7 inHg | 23.705 kPa |
| 8 inHg | 27.091 kPa |
| 9 inHg | 30.478 kPa |
| 10 inHg | 33.864 kPa |
| 14 inHg | 47.409 kPa |
| 15 inHg | 50.796 kPa |
| 20 inHg | 67.728 kPa |
| 25 inHg | 84.66 kPa |
| 30 inHg | 101.59 kPa |
| 32 inHg | 108.36 kPa |
| 35 inHg | 118.52 kPa |
| 40 inHg | 135.46 kPa |
| 50 inHg | 169.32 kPa |
| 60 inHg | 203.18 kPa |
| 75 inHg | 253.98 kPa |
| 80 inHg | 270.91 kPa |
| 100 inHg | 338.64 kPa |
| 101.325 inHg | 343.13 kPa |
| 150 inHg | 507.96 kPa |
| 200 inHg | 677.28 kPa |
| 250 inHg | 846.6 kPa |
| 300 inHg | 1015.9 kPa |
| 400 inHg | 1354.6 kPa |
| 500 inHg | 1693.2 kPa |
| 760 inHg | 2573.7 kPa |
| 1000 inHg | 3386.4 kPa |
| 1013.25 inHg | 3431.3 kPa |
| 2000 inHg | 6772.8 kPa |
| 5000 inHg | 16932 kPa |
| 10000 inHg | 33864 kPa |
| 14.7 inHg | 49.78 kPa |
| 50000 inHg | 169319 kPa |
| 100000 inHg | 338639 kPa |
| 101325 inHg | 343126 kPa |
| 200000 inHg | 677278 kPa |
| 500000 inHg | 1693195 kPa |
| 1000000 inHg | 3386389 kPa |
| 10000000 inHg | 33863890 kPa |
Real-world reference
Standard atmospheric pressure is 29.92 inHg. US weather reports typically quote barometric pressure in inHg. In kilopascals, that gives you: 1 inHg = 3.38639 kPa, 10 inHg = 33.8639 kPa, 100 inHg = 338.639 kPa.
Frequently asked questions
- How many kilopascals are in 1 inch of mercury?
- 1 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. So x inHg × 3.38639 = the equivalent in kPa.
- What is 5 inches of mercury in kilopascals?
- 5 inches of mercury equals 16.9319 kilopascals.
- What is 10 inches of mercury in kilopascals?
- 10 inches of mercury equals 33.8639 kilopascals.
- What is 100 inches of mercury in kilopascals?
- 100 inches of mercury equals 338.639 kilopascals.
- How do I convert back from kilopascals to inches of mercury?
- Multiply the kilopascal value by 0.2953. For example, 1 kPa = 0.2953 inHg.
- Is the inch of mercury bigger than the kilopascal?
- Yes. 1 inch of mercury is larger than 1 kilopascal — specifically 3.38639 times larger.
- Are these conversion factors exact?
- The factor is derived directly from the SI definitions of inch of mercury and kilopascal; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.
About the inch of mercury and the kilopascal
The kilopascal
The kilopascal (kPa) equals exactly 1,000 pascals. It is the standard pressure unit in modern meteorology, engineering specs outside the US, and most non-US tire-pressure recommendations.