Atmospheres to Pascals
An instant atmospheres-to-pascals converter, with the formula and a reference table below.
| Atmospheres | Pascals |
|---|---|
| 1 atm | 101325 Pa |
| 2 atm | 202650 Pa |
| 3 atm | 303975 Pa |
| 5 atm | 506625 Pa |
| 10 atm | 1013250 Pa |
| 25 atm | 2533125 Pa |
| 50 atm | 5066250 Pa |
| 100 atm | 10132500 Pa |
How to use
- Enter a value in the Atmospheres field.
- The Pascals figure appears immediately — no button to press.
- Typing in the Pascals field converts back to Atmospheres the same way.
- Use the reference table for the values that come up most often.
Atmospheres to Pascals formula
Converting atmospheres to pascals is a single multiplication by 101325.
Pa = atm × 101325
Why this factor: the atmosphere and the pascal are both defined against the pascal, so dividing one definition by the other gives 101325 directly. Both definitions are set out in full below.
To go the other way, divide by 101325 — or use the Pascals to Atmospheres converter, which is the same calculation reversed.
Worked example
Given 760 atm, multiplying by 101325 yields 77007000 Pa.
760 atm × 101325 = 77007000 Pa
The converter above does this for any value you type, in either direction.
What is an atmosphere?
A standard atmosphere is a fixed reference pressure, originally average sea-level air pressure.
Definition: Defined as exactly 101,325 pascals — an exact convention, not a measurement.
Where it is used: Chemistry reference conditions, diving pressure, and high-pressure physics.
What is a pascal?
The pascal is the SI unit of pressure — one newton of force spread over one square meter.
Definition: Defined as 1 N/m². Named after Blaise Pascal.
Where it is used: Scientific and engineering pressure calculations, and weather pressure in hectopascals.
Worth knowing: A single pascal is a very small pressure, which is why weather reports use hectopascals and engineering uses kilopascals.
Atmospheres vs Pascals
The atmosphere is a specialized unit while the pascal is an SI unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many pascals are in an atmosphere?
One atmosphere equals 101325 pascals.
What is the formula to convert atmospheres to pascals?
Multiply the number of atmospheres by 101325. To reverse it, divide by 101325 instead.
How do I convert pascals back to atmospheres?
Divide by 101325, which is the same as multiplying by 9.86923267e-06.
How many pascals are in 10 atmospheres?
10 atm works out to 1013250 Pa.
Is there anything to watch out for with pascals?
A single pascal is a very small pressure, which is why weather reports use hectopascals and engineering uses kilopascals.
How is the atmosphere defined?
Defined as exactly 101,325 pascals — an exact convention, not a measurement.