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Vacuum

atmtokPa

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

Factor1 atm = 101.325 kPa

Converter

atm

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

Result
101.325kPa

Rendered to 6 significant figures.

Formula

Formula
kPa = atm × 101.325

Multiply any value in standard atmospheres (vacuum) by 101.325 to obtain the value in kilopascals (vacuum).

Worked example

Convert 1 atm to kPa.

  1. 01Start with 1 atm.
  2. 02Multiply by the conversion factor: 1 × 101.325 = 101.325 kPa.
Result1 atm = 101.325 kPa

Conversion table

atmkPa
1101.33
2202.65
5506.63
101013.3
202026.5
505066.3
10010133
20020265
50050663
10001.0133e+5

Reference values rounded to 5 significant figures for display.

FAQ

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