Atmosphere Pascal Converter
Convert standard atmosphere (atm) and pascal (Pa) from the same pressure value. Enter a value to update the result window plus kPa and bar summary cards.
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Read standard atmosphere and pascal as the same pressure
This converter changes a pressure value between standard atmosphere (atm) and pascal (Pa). Pascal is the SI pressure unit used in science and engineering, while atm is often used to describe pressure relative to a standard sea-level atmosphere.
Use the left window for the value you have and the right window for the converted value. The conversion uses 1 atm = 101,325 Pa. The summary cards keep atm, Pa, kPa, and bar visible so large pressure numbers are easier to compare.
Use it in screen order
- Leave the input in atm mode to convert atm to Pa. The default 1 atm becomes 101,325 Pa.
- Use Switch direction when your source value is in Pa and you need atm.
- kPa is Pa divided by 1000, so 101,325 Pa is 101.325 kPa.
- Copy both the original and converted units when pressure conditions need to be documented.
Units and basis
- Pa means pascal, the SI unit of pressure.
- atm means standard atmosphere. NIST lists 1 atm = 101,325 Pa.
- 1 atm equals 101.325 kPa, a convenient scale for atmospheric pressure.
- bar equals 100,000 Pa and is a common non-SI pressure unit.
Example conversions
The conversion is direct once the standard atmosphere value is fixed.
Cautions
- atm is a standard pressure unit; real atmospheric pressure changes with altitude and weather.
- Absolute pressure and gauge pressure use different reference points. Unit conversion alone does not change that reference.
- Pa values can be large, so kPa or bar may be easier to read in reports.
- This page converts units only. Equipment safety still depends on rated pressure and operating conditions.
FAQ
How many pascals are in one atmosphere?
1 standard atmosphere is 101,325 Pa, or 101.325 kPa.
What is the difference between Pa and kPa?
1 kPa is 1000 Pa. kPa is often easier to read for larger pressure values.
Is atm the same as real air pressure?
atm is a standard atmosphere unit. Actual air pressure varies with altitude and weather.
Is bar also a pressure unit?
Yes. 1 bar equals 100,000 Pa, so 1 atm is about 1.01325 bar.
Can I convert absolute and gauge pressure?
The units can be converted, but absolute and gauge pressure use different zero references. Keep abs, absolute, gauge, or g labels with the value.
References used
The standard atmosphere relationship follows the NIST Guide to the SI Appendix B conversion factors for standard atmosphere to pascal.