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Vacuum

mmHgtombar

Convert millimetres of mercury (vacuum) (mmHg) to millibars (vacuum) (mbar).

Factor1 mmHg = 1.333224 mbar

Converter

mmHg

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1013.25mbar

Rendered to 6 significant figures.

Formula

Formula
mbar = mmHg × 1.333224

Multiply any value in millimetres of mercury (vacuum) by 1.333224 to obtain the value in millibars (vacuum).

Worked example

Convert 760 mmHg to mbar.

  1. 01Start with 760 mmHg.
  2. 02Multiply by the conversion factor: 760 × 1.333224 = 1013.25 mbar.
Result760 mmHg = 1013.25 mbar

Conversion table

mmHgmbar
11.3332
22.6664
56.6661
1013.332
2026.664
5066.661
100133.32
200266.64
500666.61
10001333.2

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mmHg to mbar?
1 mmHg equals 1.333224 mbar. To convert, multiply the value in millimetres of mercury (vacuum) by 1.333224.
How do I convert 1 mmHg to mbar?
1 mmHg = 1.33322 mbar. For any value, multiply by 1.333224.
How do I convert mbar back to mmHg?
Divide by the same factor — or equivalently, multiply by 0.7500616. So 1 mbar = 0.750062 mmHg.
When would I need to convert millimetre of mercury (vacuum) to millibar (vacuum)?
Vacuum-pressure conversions between mmHg and mbar 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).

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