Convert Megapascals to Atmospheres
1 megapascal (MPa) equals 9.869232667 atmospheres (atm).
1 MPa = 9.869232667 atm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk megapascal to atmosphere converter to paste a column from Excel.
How to Convert Megapascal to Atmosphere
- 1 MPa = 9.869232667 atm
- 1 atm = 0.101325 MPa
- Example: convert 15 MPa to atm: 15 MPa = 15 × 9.869232667 atm = 148.03849 atm
Formula
atm = MPa × 9.86923266716
Derivation from SI units:
- 1 MPa = 10⁶ Pa = 1 N/mm²
- 1 atm = 101 325 Pa (exact, by definition)
- 1 MPa = 1000000 Pa ÷ 101325 Pa per atm = 9.86923266716 atm
Both units are defined exactly, so the factor is exact. Megapascal definition: megapascal; Atmosphere definition: atmosphere.
Worked examples
- A reading of 2 MPa converts to 19.73846533 atm.
2 MPa × 9.869232667 = 19.73846533 atm - A value of 30 MPa is 296.07698 atm.
30 MPa × 9.869232667 = 296.07698 atm
Megapascal to Atmosphere conversion table
| Megapascals (MPa) | Atmospheres (atm) |
|---|---|
| 0.01 MPa | 0.09869232667 atm |
| 0.05 MPa | 0.4934616334 atm |
| 0.1 MPa | 0.9869232667 atm |
| 0.2 MPa | 1.973846533 atm |
| 0.5 MPa | 4.934616334 atm |
| 0.7 MPa | 6.908462867 atm |
| 1 MPa | 9.869232667 atm |
| 1.5 MPa | 14.803849 atm |
| 2 MPa | 19.73846533 atm |
| 2.5 MPa | 24.67308167 atm |
| 5 MPa | 49.34616334 atm |
| 7 MPa | 69.08462867 atm |
| 10 MPa | 98.69232667 atm |
| 15 MPa | 148.03849 atm |
| 20 MPa | 197.3846533 atm |
| 25 MPa | 246.7308167 atm |
| 30 MPa | 296.07698 atm |
| 40 MPa | 394.7693067 atm |
| 50 MPa | 493.4616334 atm |
| 70 MPa | 690.8462867 atm |
| 100 MPa | 986.9232667 atm |
| 200 MPa | 1973.846533 atm |
| 250 MPa | 2467.308167 atm |
| 355 MPa | 3503.577597 atm |
| 500 MPa | 4934.616334 atm |
Where it's used
Megapascals are used for concrete compressive strength (typically 20–50 MPa), while atmospheres appear in chemistry and gas laws (STP and NTP conditions). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Megapascal to other pressure units
| Conversion | 1 MPa equals |
|---|---|
| megapascal to pascal | 1000000 Pa |
| megapascal to kilopascal | 1000 kPa |
| megapascal to psi | 145.0377377 psi |
| megapascal to bar | 10 bar |
| megapascal to millibar | 10000 mbar |
| megapascal to decibar | 100 dbar |
| megapascal to torr | 7500.616827 Torr |
| megapascal to millimeter of mercury | 7500.615758 mmHg |
| megapascal to millimeter of water | 101971.6213 mmH₂O |
| megapascal to centimeter of water | 10197.16213 cmH₂O |
| megapascal to inch of water | 4014.63076 inH₂O |
| megapascal to inch of water (60 °F) | 4018.64652 inH₂O (60 °F) |
| megapascal to inch of mercury | 295.299833 inHg |
| megapascal to atmosphere | 9.869232667 atm |
| megapascal to barye | 10000000 Ba |
Frequently asked questions
How many atmospheres are in 1 megapascal?
1 MPa = 9.869232667 atm.
How do I convert megapascals to atmospheres?
Multiply the value in MPa by 9.869232667. For example, 15 MPa × 9.869232667 = 148.03849 atm.
Is the MPa to atm conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "atmosphere, standard (atm)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Megapascals to Atmospheres. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/megapascal-to-atmosphere/
IEEE
Scientific Converters, "Convert Megapascals to Atmospheres," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/megapascal-to-atmosphere/