Convert Atmospheres to Pascals
Atmospheres to pascals is the conversion you need when a pressure reading is quoted in atmospheres but your instrument, formula, or standard works in pascals. One standard atmosphere is exactly 101,325 pascals — roughly the average air pressure at sea level — so the pascal number always comes out much larger.
Atmospheres to Pascals conversion table
| Atmospheres (atm) | Pascals (Pa) |
|---|---|
| 1 | 101,325 |
| 2 | 202,650 |
| 3 | 303,975 |
| 5 | 506,625 |
| 10 | 1,013,250 |
| 20 | 2,026,500 |
| 50 | 5,066,250 |
| 100 | 10,132,500 |
| 500 | 50,662,500 |
| 1,000 | 101,325,000 |
The formula
To convert atmospheres to pascals, multiply the number of atmospheres by 101,325:
pascals = atmospheres × 101,325
A worked example
Say a pressure gauge reads 2 atmospheres and you need it in pascals:
2 × 101,325 = 202,650 Pa
So 2 atmospheres is exactly 202,650 pascals.
Why the number is exact
The "atmosphere" here is the standard atmosphere (atm), which is defined as exactly 101,325 pascals — it isn't measured, it's set by agreement. That makes the conversion an exact one: one atmosphere is exactly 101,325 Pa, with nothing rounded off.
When you'll use it
Reading weather or physics figures quoted in atmospheres and plugging them into SI formulas, working with gas-law problems, or matching a pressure spec that's written in pascals to one written in atmospheres.
Frequently asked questions
How many pascals are in one atmosphere?
Exactly 101,325 pascals. The standard atmosphere is defined as exactly 101,325 Pa, so this is a fixed number, not a rounded one.
Is one atmosphere the same as sea-level air pressure?
It's close. One standard atmosphere (101,325 Pa) was set to roughly match average air pressure at sea level. The real air pressure where you are drifts a little above or below that with weather and altitude.
Is the atmospheres to pascals conversion exact?
Yes. The standard atmosphere is defined as exactly 101,325 pascals, so nothing is rounded away.