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Vacuum

inHgtoµm Hg

Convert inches of mercury (vacuum) (inHg) to microns of mercury (µm Hg).

Factor1 inHg = 25400.01 µm Hg

Converter

inHg

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

Result
25400µm Hg

Rendered to 6 significant figures.

Formula

Formula
µm Hg = inHg × 25400.01

Multiply any value in inches of mercury (vacuum) by 25400.01 to obtain the value in microns of mercury.

Worked example

Convert 1 inHg to µm Hg.

  1. 01Start with 1 inHg.
  2. 02Multiply by the conversion factor: 1 × 25400.01 = 25400 µm Hg.
Result1 inHg = 25400 µm Hg

Conversion table

inHgµm Hg
125400
250800
51.2700e+5
102.5400e+5
205.0800e+5
501.2700e+6
1002.5400e+6
2005.0800e+6
5001.27e+7
10002.54e+7

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from inHg to µm Hg?
1 inHg equals 25400.01 µm Hg. To convert, multiply the value in inches of mercury (vacuum) by 25400.01.
How do I convert 1 inHg to µm Hg?
1 inHg = 25400 µm Hg. For any value, multiply by 25400.01.
How do I convert µm Hg back to inHg?
Divide by the same factor — or equivalently, multiply by 3.937007e-5. So 1 µm Hg = 3.93701e-5 inHg.
When would I need to convert inch of mercury (vacuum) to micron of mercury?
Vacuum-pressure conversions between inHg and µm Hg 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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