Atmospheres to Pascals Converter
Unit ConversionConvert standard atmospheres to pascals. 1 standard atmosphere equals exactly 101,325 pascals, with a conversion table and the reverse conversion.
Pascals
Equivalent pressure in pascals
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SponsoredThis converter turns standard atmospheres into pascals (atm to Pa). Enter a value and the result updates as you type. 1 standard atmosphere equals exactly 101,325 pascals.
1 standard atmosphere is exactly 101,325 pascals, a reference value close to average sea-level air pressure. Since the pascal is the SI unit of pressure, this is the conversion that ties the atmosphere to the SI. Pascal values get large quickly, so results are often written in kilopascals: 1 atm = 101.325 kPa.
The result shows 0 for a negative entry, because absolute pressure, counted from a perfect vacuum, cannot be negative. The result is rounded to 2 decimal places.
How to Convert Atmospheres to Pascals
To convert standard atmospheres to pascals, multiply by 101,325. For example, 2.5 atm equals 253,312.5 Pa.
To go from pascals back to standard atmospheres, divide pascals by 101,325.
Atmospheres to Pascals Conversion Table
Common atm values converted to pascals, rounded to 2 decimal places.
| Atmospheres | Pascals |
|---|---|
| 0.1 atm | 10,132.5 Pa |
| 0.5 atm | 50,662.5 Pa |
| 1 atm | 101,325 Pa |
| 1.5 atm | 151,987.5 Pa |
| 2 atm | 202,650 Pa |
| 2.5 atm | 253,312.5 Pa |
| 3 atm | 303,975 Pa |
| 5 atm | 506,625 Pa |
| 10 atm | 1,013,250 Pa |
| 50 atm | 5,066,250 Pa |
| 100 atm | 10,132,500 Pa |
Why 101,325 Pascals
The value was set in 1954, when the General Conference on Weights and Measures adopted the standard atmosphere as exactly 101,325 newtons per square meter. A pascal is one newton per square meter, so 1 atm equals exactly 101,325 Pa. NOAA uses the same standard for sea-level pressure.
Pascals or Atmospheres?
Use pascals with SI formulas: P = F/A with force in newtons and area in square meters, or the gas constant R = 8.314 J/(mol·K). Use atmospheres with R = 0.0820574 L·atm/(mol·K). Pressure under water adds to the air above it: every 33 feet (10.06 meters) of seawater adds about one atmosphere, according to NOAA, so the total pressure at that depth is about 2 atm, or about 202,650 Pa.
Large pascal values are easier to handle in powers of ten (101,325 Pa is about 1.01 × 10⁵ Pa), which the Scientific Notation Converter writes out. Gas calculations go the other way, from pascals to atmospheres, for the Ideal Gas Law Calculator.
Frequently Asked Questions
How do I write 1 atm in scientific notation?
1 atm equals exactly 101,325 Pa, written 1.01325 × 10⁵ Pa. For example, 2.5 atm equals exactly 253,312.5 Pa, or 2.533125 × 10⁵ Pa.
Is 1 atm the same as 100,000 Pa?
No. 100,000 Pa is 1 bar. 1 atm is 101,325 Pa, about 1.3% more.
Is the standard atmosphere the air pressure outside?
Only approximately. It is a fixed reference close to average sea-level pressure. Real air pressure changes with the weather and is lower at higher elevation.
Is the Atmospheres to Pascals factor exact?
Yes. 1 standard atmosphere equals exactly 101,325 pascals, because one standard atmosphere is defined as 101,325 pascals. The calculator still rounds the displayed result to 2 decimal places.
What happens if I enter a negative value?
It shows 0. Atmospheres and pascals here measure absolute pressure, which cannot be below a perfect vacuum.
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