Vacuum
inHgtokPa
Convert inches of mercury (vacuum) (inHg) to kilopascals (vacuum) (kPa).
Factor1 inHg = 3.386389 kPa
Converter
inHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kPa
Rendered to 6 significant figures.
Formula
Formula
kPa = inHg × 3.386389
Multiply any value in inches of mercury (vacuum) by 3.386389 to obtain the value in kilopascals (vacuum).
Worked example
Convert 30 inHg to kPa.
- 01Start with 30 inHg.
- 02Multiply by the conversion factor: 30 × 3.386389 = 101.592 kPa.
Result30 inHg = 101.592 kPa
Conversion table
| inHg | kPa |
|---|---|
| 1 | 3.3864 |
| 2 | 6.7728 |
| 5 | 16.932 |
| 10 | 33.864 |
| 20 | 67.728 |
| 50 | 169.32 |
| 100 | 338.64 |
| 200 | 677.28 |
| 500 | 1693.2 |
| 1000 | 3386.4 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inHg to kPa?
1 inHg equals 3.386389 kPa. To convert, multiply the value in inches of mercury (vacuum) by 3.386389.
How do I convert 1 inHg to kPa?
1 inHg = 3.38639 kPa. For any value, multiply by 3.386389.
How do I convert kPa back to inHg?
Divide by the same factor — or equivalently, multiply by 0.2952998. So 1 kPa = 0.2953 inHg.
When would I need to convert inch of mercury (vacuum) to kilopascal (vacuum)?
Vacuum-pressure conversions between inHg and kPa are common in vacuum-chamber instrumentation, pump-down endpoint specification, semiconductor and deposition process work, freeze-drying, electron-microscopy column pressure, vacuum metallurgy and HVAC / refrigeration service. Torr, mmHg and inHg dominate manometric vacuum gauges; mbar is standard on European instruments; micron Hg and mTorr cover high-vacuum work; Pa and kPa are the SI references. This category is vacuum / instrumentation intent — dimensionally the same as pressure, but kept separate so process-pressure searches and vacuum searches stay on the right page.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).