Pressure
Patoatm
Convert pascals (Pa) to standard atmospheres (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 by 9.869233e-6 to obtain the value in standard atmospheres.
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 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 to standard atmosphere?
Pressure conversions between Pa and atm are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
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).