Convert Atmospheres to Pascals
1 standard atmosphere is 101,325 Pa. One standard atmosphere is exactly 101325 pascals.
One standard atmosphere is 101325 pascals. To convert atmospheres to pascals, multiply by 101325; to go the other way, divide by 101325 or multiply by 9.8692 × 10^-6. The factor is exact rather than rounded: it follows from NIST Special Publication 811.
Factor checked against the defining standard · How we check
- Atmospheres × 101325
value * 101325101,325 Pa
1 standard atmosphere in every pressure unit
| Unit | Value | Exact factor |
|---|---|---|
| pounds per square inch | 14.69594878 psi | × 14.6959487755 |
| bars | 1.01325 bar | × 1.01325 |
| pascals | 101,325 Pa | × 101,325 |
| kilopascals | 101.325 kPa | × 101.325 |
| megapascals | 0.101325 MPa | × 0.101325 |
| atmospheres (as entered) | 1 atm | — |
| torr | 760 Torr | × 760 |
| inches of mercury | 29.9212524 inHg | × 29.9212524019 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert atmospheres to pascals?
- 1.Take the measurement in atmospheres.
- 2.Multiply by 101325 — that is how many pascals fit in one standard atmosphere.
- 3.To go back the other way, divide by 101325, or multiply by 9.8692 × 10^-6.
Worked example: 25 atmospheres to pascals
- Formula
- atm × 101325 = Pa
- Arithmetic
- 25 × 101325 = 2,533,125 Pa
- Answer
- 25 atm = 2,533,125 Pa
The factor is exact, so this figure is exact too — only the display is rounded.
Atmospheres to pascals conversion table
| Atmospheres | Pascals |
|---|---|
| 1 atm | 101,325 Pa |
| 2 atm | 202,650 Pa |
| 3 atm | 303,975 Pa |
| 4 atm | 405,300 Pa |
| 5 atm | 506,625 Pa |
| 6 atm | 607,950 Pa |
| 7 atm | 709,275 Pa |
| 8 atm | 810,600 Pa |
| 9 atm | 911,925 Pa |
| 10 atm | 1,013,250 Pa |
| 12 atm | 1,215,900 Pa |
| 15 atm | 1,519,875 Pa |
| 20 atm | 2,026,500 Pa |
| 25 atm | 2,533,125 Pa |
| 50 atm | 5,066,250 Pa |
| 100 atm | 10,132,500 Pa |
| 200 atm | 20,265,000 Pa |
| 300 atm | 30,397,500 Pa |
| 500 atm | 50,662,500 Pa |
| 1000 atm | 101,325,000 Pa |
| 2000 atm | 202,650,000 Pa |
| 5000 atm | 506,625,000 Pa |
| 10000 atm | 1,013,250,000 Pa |
What is a standard atmosphere?
Exactly 101,325 pascals by definition, not by measurement — it was fixed as a reference, and the real pressure outside your window is never precisely it.
What is a pascal?
The SI unit: one newton spread over one square metre. It is a small pressure — a sheet of paper resting on a table is about one pascal — which is why the kilopascal is what instruments actually read.
How many pascals are in a standard atmosphere?
One standard atmosphere is 101325 pascals, exactly. Going the other way, one pascal is 9.8692 × 10^-6 atmospheres. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every pressure unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Pounds per square inch | psi | 6894.7573 pascal |
| Bars | bar | 100000 pascal |
| Pascals | Pa | the base unit |
| Kilopascals | kPa | 1000 pascal |
| Megapascals | MPa | 1000000 pascal |
| Atmospheres | atm | 101325 pascal |
| Torr | Torr | 133.32237 pascal |
| Inches of mercury | inHg | 3386.389 pascal |
Questions people actually ask
- How many pascals are in a standard atmosphere?
- 101325. The SI unit: one newton spread over one square metre. It is a small pressure — a sheet of paper resting on a table is about one pascal — which is why the kilopascal is what instruments actually read.
- How do I convert pascals back to atmospheres?
- Divide by 101325, or multiply by 9.8692 × 10^-6 — they are the same operation.
Other pressure conversions
Pascals to atmospheres — the same conversion the other way.