inHg to kPa Converter
Type a value in either field; the other updates instantly.
1 inHg = 3.38639 kPa 1 kPa = 0.2953 inHg
Formula
Worked example: 29.92 inHg × 3.38639 = 101.32 kPa
inHg to kPa conversion table
| inHg | kPa | psi |
|---|---|---|
| 1 | 3.3864 | 0.49115 |
| 2 | 6.7728 | 0.98231 |
| 5 | 16.932 | 2.4558 |
| 10 | 33.864 | 4.9115 |
| 15 | 50.796 | 7.3673 |
| 20 | 67.728 | 9.8231 |
| 25 | 84.66 | 12.279 |
| 28 | 94.819 | 13.752 |
| 29 | 98.205 | 14.243 |
| 29.5 | 99.898 | 14.489 |
| 29.92 | 101.32 | 14.695 |
| 30 | 101.59 | 14.735 |
| 30.5 | 103.28 | 14.98 |
| 31 | 104.98 | 15.226 |
Where this conversion is used
Barometric pressure in North America is reported in inHg, while most of the world and most engineering software use kPa or hPa. The same conversion applies to manifold pressure gauges and vacuum gauges marked in inHg.
29.92 inHg is standard sea-level pressure, 101.325 kPa. On a vacuum gauge, 25 inHg vacuum means 84.7 kPa below atmosphere, which is 16.7 kPa absolute at sea level.
Frequently asked questions
How many kPa are in 1 inch of mercury?
1 inHg = 3.38639 kPa. In the other direction, 1 kPa = 0.2953 inHg.
How do I convert inches of mercury to kPa?
Multiply the value in inHg by 3.38639. Example: 29.92 inHg = 101.32 kPa.
What is 29.92 inHg in kPa?
29.92 inHg is 101.32 kPa, the standard atmosphere (101.325 kPa).
How do I convert inHg vacuum to kPa absolute?
Convert the vacuum reading to kPa (× 3.386) and subtract it from local atmospheric pressure: at sea level, 25 inHg vacuum = 101.325 − 84.66 = 16.7 kPa absolute.