Convert Atmospheres to Megapascals
1 standard atmosphere is 0.101325 MPa. One standard atmosphere is exactly 0.101325 megapascals.
One standard atmosphere is 0.101325 megapascals. To convert atmospheres to megapascals, multiply by 0.101325; to go the other way, divide by 0.101325 or multiply by 9.8692327. The factor is exact rather than rounded: it follows from NIST Special Publication 811.
Factor checked against the defining standard · How we check
- Atmospheres × 0.101325
value * 0.1013250.101 MPa
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 megapascals?
- 1.Take the measurement in atmospheres.
- 2.Multiply by 0.101325 — that is how many megapascals fit in one standard atmosphere.
- 3.To go back the other way, divide by 0.101325, or multiply by 9.8692327.
Worked example: 25 atmospheres to megapascals
- Formula
- atm × 0.101325 = MPa
- Arithmetic
- 25 × 0.101325 = 2.533125 MPa
- Answer
- 25 atm = 2.533125 MPa
The factor is exact, so this figure is exact too — only the display is rounded.
Atmospheres to megapascals conversion table
| Atmospheres | Megapascals |
|---|---|
| 1 atm | 0.101325 MPa |
| 2 atm | 0.20265 MPa |
| 3 atm | 0.303975 MPa |
| 4 atm | 0.4053 MPa |
| 5 atm | 0.506625 MPa |
| 6 atm | 0.60795 MPa |
| 7 atm | 0.709275 MPa |
| 8 atm | 0.8106 MPa |
| 9 atm | 0.911925 MPa |
| 10 atm | 1.01325 MPa |
| 12 atm | 1.2159 MPa |
| 15 atm | 1.519875 MPa |
| 20 atm | 2.0265 MPa |
| 25 atm | 2.533125 MPa |
| 50 atm | 5.06625 MPa |
| 100 atm | 10.1325 MPa |
| 200 atm | 20.265 MPa |
| 300 atm | 30.3975 MPa |
| 500 atm | 50.6625 MPa |
| 1000 atm | 101.325 MPa |
| 2000 atm | 202.65 MPa |
| 5000 atm | 506.625 MPa |
| 10000 atm | 1,013.25 MPa |
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 megapascal?
A million pascals. Concrete strength and hydraulic ratings are specified here: 30 MPa concrete is about 4,350 psi.
How many megapascals are in a standard atmosphere?
One standard atmosphere is 0.101325 megapascals, exactly. Going the other way, one megapascal is 9.8692327 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 megapascals are in a standard atmosphere?
- 0.101325. A million pascals. Concrete strength and hydraulic ratings are specified here: 30 MPa concrete is about 4,350 psi.
- How do I convert megapascals back to atmospheres?
- Divide by 0.101325, or multiply by 9.8692327 — they are the same operation.
Other pressure conversions
Megapascals to atmospheres — the same conversion the other way.