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Vacuum

atmtoµbar

Convert standard atmospheres (vacuum) (atm) to microbar (vacuum) (µbar).

Factor1 atm = 1013250 µbar

Converter

atm

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

Result
1.01325e+6µbar

Rendered to 6 significant figures.

Formula

Formula
µbar = atm × 1013250

Multiply any value in standard atmospheres (vacuum) by 1013250 to obtain the value in microbar (vacuum).

Worked example

Convert 1 atm to µbar.

  1. 01Start with 1 atm.
  2. 02Multiply by the conversion factor: 1 × 1013250 = 1.01325e+6 µbar.
Result1 atm = 1.01325e+6 µbar

Conversion table

atmµbar
11.0133e+6
22.0265e+6
55.0663e+6
101.0133e+7
202.0265e+7
505.0663e+7
1001.0133e+8
2002.0265e+8
5005.0663e+8
10001.0133e+9

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from atm to µbar?
1 atm equals 1013250 µbar. To convert, multiply the value in standard atmospheres (vacuum) by 1013250.
How do I convert 1 atm to µbar?
1 atm = 1.01325e+6 µbar. For any value, multiply by 1013250.
How do I convert µbar back to atm?
Divide by the same factor — or equivalently, multiply by 9.869233e-7. So 1 µbar = 9.86923e-7 atm.
When would I need to convert standard atmosphere (vacuum) to microbar (vacuum)?
Vacuum-pressure conversions between atm and µbar 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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