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Vacuum

µm Hgtombar

Convert microns of mercury (µm Hg) to millibars (vacuum) (mbar).

Factor1 µm Hg = 0.001333224 mbar

Converter

µm Hg

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

Result
13.3322mbar

Rendered to 6 significant figures.

Formula

Formula
mbar = µm Hg × 0.001333224

Multiply any value in microns of mercury by 0.001333224 to obtain the value in millibars (vacuum).

Worked example

Convert 10000 µm Hg to mbar.

  1. 01Start with 10000 µm Hg.
  2. 02Multiply by the conversion factor: 10000 × 0.001333224 = 13.3322 mbar.
Result10000 µm Hg = 13.3322 mbar

Conversion table

µm Hgmbar
10.0013332
20.0026664
50.0066661
100.013332
200.026664
500.066661
1000.13332
2000.26664
5000.66661
10001.3332

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from µm Hg to mbar?
1 µm Hg equals 0.001333224 mbar. To convert, multiply the value in microns of mercury by 0.001333224.
How do I convert 1 µm Hg to mbar?
1 µm Hg = 0.00133322 mbar. For any value, multiply by 0.001333224.
How do I convert mbar back to µm Hg?
Divide by the same factor — or equivalently, multiply by 750.0617. So 1 mbar = 750.062 µm Hg.
When would I need to convert micron of mercury to millibar (vacuum)?
Vacuum-pressure conversions between µm Hg 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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