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Vacuum

kPatoatm

Convert kilopascals (vacuum) (kPa) to standard atmospheres (vacuum) (atm).

Factor1 kPa = 0.009869233 atm

Converter

kPa

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

Result
1atm

Rendered to 6 significant figures.

Formula

Formula
atm = kPa × 0.009869233

Multiply any value in kilopascals (vacuum) by 0.009869233 to obtain the value in standard atmospheres (vacuum).

Worked example

Convert 101.325 kPa to atm.

  1. 01Start with 101.325 kPa.
  2. 02Multiply by the conversion factor: 101.325 × 0.009869233 = 1 atm.
Result101.325 kPa = 1 atm

Conversion table

kPaatm
10.0098692
20.019738
50.049346
100.098692
200.19738
500.49346
1000.98692
2001.9738
5004.9346
10009.8692

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kPa to atm?
1 kPa equals 0.009869233 atm. To convert, multiply the value in kilopascals (vacuum) by 0.009869233.
How do I convert 1 kPa to atm?
1 kPa = 0.00986923 atm. For any value, multiply by 0.009869233.
How do I convert atm back to kPa?
Divide by the same factor — or equivalently, multiply by 101.325. So 1 atm = 101.325 kPa.
When would I need to convert kilopascal (vacuum) to standard atmosphere (vacuum)?
Vacuum-pressure conversions between kPa and atm 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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