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Vacuum

mmHgtomPa

Convert millimetres of mercury (vacuum) (mmHg) to millipascals (vacuum) (mPa).

Factor1 mmHg = 133322.4 mPa

Converter

mmHg

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

Result
133322mPa

Rendered to 6 significant figures.

Formula

Formula
mPa = mmHg × 133322.4

Multiply any value in millimetres of mercury (vacuum) by 133322.4 to obtain the value in millipascals (vacuum).

Worked example

Convert 1 mmHg to mPa.

  1. 01Start with 1 mmHg.
  2. 02Multiply by the conversion factor: 1 × 133322.4 = 133322 mPa.
Result1 mmHg = 133322 mPa

Conversion table

mmHgmPa
11.3332e+5
22.6664e+5
56.6661e+5
101.3332e+6
202.6664e+6
506.6661e+6
1001.3332e+7
2002.6664e+7
5006.6661e+7
10001.3332e+8

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mmHg to mPa?
1 mmHg equals 133322.4 mPa. To convert, multiply the value in millimetres of mercury (vacuum) by 133322.4.
How do I convert 1 mmHg to mPa?
1 mmHg = 133322 mPa. For any value, multiply by 133322.4.
How do I convert mPa back to mmHg?
Divide by the same factor — or equivalently, multiply by 7.500616e-6. So 1 mPa = 7.50062e-6 mmHg.
When would I need to convert millimetre of mercury (vacuum) to millipascal (vacuum)?
Vacuum-pressure conversions between mmHg and mPa 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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