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Vacuum

µbartombar

Convert microbar (vacuum) (µbar) to millibars (vacuum) (mbar).

Factor1 µbar = 0.001 mbar

Converter

µbar

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

Result
1mbar

Rendered to 6 significant figures.

Formula

Formula
mbar = µbar × 0.001

Multiply any value in microbar (vacuum) by 0.001 to obtain the value in millibars (vacuum).

Worked example

Convert 1000 µbar to mbar.

  1. 01Start with 1000 µbar.
  2. 02Multiply by the conversion factor: 1000 × 0.001 = 1 mbar.
Result1000 µbar = 1 mbar

Conversion table

µbarmbar
10.001
20.002
50.005
100.01
200.02
500.05
1000.1
2000.2
5000.5
10001

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from µbar to mbar?
1 µbar equals 0.001 mbar. To convert, multiply the value in microbar (vacuum) by 0.001.
How do I convert 1 µbar to mbar?
1 µbar = 0.001 mbar. For any value, multiply by 0.001.
How do I convert mbar back to µbar?
Divide by the same factor — or equivalently, multiply by 1000. So 1 mbar = 1000 µbar.
When would I need to convert microbar (vacuum) to millibar (vacuum)?
Vacuum-pressure conversions between µbar 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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