Vacuum
TorrtommHg
Convert torr (vacuum) (Torr) to millimetres of mercury (vacuum) (mmHg).
Factor1 Torr = 0.9999999 mmHg
Converter
Torr
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mmHg
Rendered to 6 significant figures.
Formula
Formula
mmHg = Torr × 0.9999999
Multiply any value in torr (vacuum) by 0.9999999 to obtain the value in millimetres of mercury (vacuum).
Worked example
Convert 760 Torr to mmHg.
- 01Start with 760 Torr.
- 02Multiply by the conversion factor: 760 × 0.9999999 = 760 mmHg.
Result760 Torr = 760 mmHg
Conversion table
| Torr | mmHg |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 5 | 5 |
| 10 | 10 |
| 20 | 20 |
| 50 | 50 |
| 100 | 100 |
| 200 | 200 |
| 500 | 500 |
| 1000 | 1000 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Torr to mmHg?
1 Torr equals 0.9999999 mmHg. To convert, multiply the value in torr (vacuum) by 0.9999999.
How do I convert 1 Torr to mmHg?
1 Torr = 1 mmHg. For any value, multiply by 0.9999999.
How do I convert mmHg back to Torr?
Divide by the same factor — or equivalently, multiply by 1. So 1 mmHg = 1 Torr.
When would I need to convert torr (vacuum) to millimetre of mercury (vacuum)?
Vacuum-pressure conversions between Torr and mmHg 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).