Vacuum
inHgtoTorr
Convert inches of mercury (vacuum) (inHg) to torr (vacuum) (Torr).
Factor1 inHg = 25.40001 Torr
Converter
inHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
Torr
Rendered to 6 significant figures.
Formula
Formula
Torr = inHg × 25.40001
Multiply any value in inches of mercury (vacuum) by 25.40001 to obtain the value in torr (vacuum).
Worked example
Convert 30 inHg to Torr.
- 01Start with 30 inHg.
- 02Multiply by the conversion factor: 30 × 25.40001 = 762 Torr.
Result30 inHg = 762 Torr
Conversion table
| inHg | Torr |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 50 | 1270 |
| 100 | 2540 |
| 200 | 5080 |
| 500 | 12700 |
| 1000 | 25400 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inHg to Torr?
1 inHg equals 25.40001 Torr. To convert, multiply the value in inches of mercury (vacuum) by 25.40001.
How do I convert 1 inHg to Torr?
1 inHg = 25.4 Torr. For any value, multiply by 25.40001.
How do I convert Torr back to inHg?
Divide by the same factor — or equivalently, multiply by 0.03937007. So 1 Torr = 0.0393701 inHg.
When would I need to convert inch of mercury (vacuum) to torr (vacuum)?
Vacuum-pressure conversions between inHg and Torr 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).