Vacuum
Patoatm
Convert pascals (vacuum) (Pa) to standard atmospheres (vacuum) (atm).
Factor1 Pa = 9.869233e-6 atm
Converter
Pa
Accepts numbers or expressions, e.g. 150 + 14.7
Result
atm
Rendered to 6 significant figures.
Formula
Formula
atm = Pa × 9.869233e-6
Multiply any value in pascals (vacuum) by 9.869233e-6 to obtain the value in standard atmospheres (vacuum).
Worked example
Convert 101325 Pa to atm.
- 01Start with 101325 Pa.
- 02Multiply by the conversion factor: 101325 × 9.869233e-6 = 1 atm.
Result101325 Pa = 1 atm
Conversion table
| Pa | atm |
|---|---|
| 1 | 9.8692e-6 |
| 2 | 1.9738e-5 |
| 5 | 4.9346e-5 |
| 10 | 9.8692e-5 |
| 20 | 0.00019738 |
| 50 | 0.00049346 |
| 100 | 0.00098692 |
| 200 | 0.0019738 |
| 500 | 0.0049346 |
| 1000 | 0.0098692 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Pa to atm?
1 Pa equals 9.869233e-6 atm. To convert, multiply the value in pascals (vacuum) by 9.869233e-6.
How do I convert 1 Pa to atm?
1 Pa = 9.86923e-6 atm. For any value, multiply by 9.869233e-6.
How do I convert atm back to Pa?
Divide by the same factor — or equivalently, multiply by 101325. So 1 atm = 101325 Pa.
When would I need to convert pascal (vacuum) to standard atmosphere (vacuum)?
Vacuum-pressure conversions between Pa 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).