Atmospheres to Megapascals Converter
Enter the pressure in atmospheres below to convert it to megapascals.
Convert Atmospheres to Megapascals
Enter a value in atmospheres (atm) to convert to megapascals (MPa).
Standard Atmosphere to Megapascal Conversion Table
Table showing various standard atmosphere measurements converted to megapascals. Click any preset value or arrow to load it into the converter.
| Atmospheres (atm) | Megapascals (MPa) |
|---|---|
| 1 atm | 0.101325 MPa |
| 2 atm | 0.20265 MPa |
| 2.5 atm | 0.2533125 MPa |
| 5 atm | 0.506625 MPa |
| 10 atm | 1.01325 MPa |
| 15 atm | 1.519875 MPa |
| 20 atm | 2.0265 MPa |
| 25 atm | 2.533125 MPa |
| 30 atm | 3.03975 MPa |
| 50 atm | 5.06625 MPa |
How to Convert Atmospheres to Megapascals
To convert atmospheres to megapascals, multiply the pressure by the following conversion ratio: 0.101325 megapascals/standard atmosphere.
Since one standard atmosphere is equal to 0.101325 megapascals, you can use this simple formula to convert:
The pressure in megapascals is equal to the pressure in atmospheres multiplied by 0.101325.
For example, here's how to convert 5 atmospheres to megapascals using the formula above.
How Many Megapascals Are in a Standard Atmosphere?
There are 0.101325 megapascals in a standard atmosphere, which is why we use this value in the formula above.
Our standard atmosphere to megapascal calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Atmospheres and megapascals are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Standard Atmosphere?
A standard atmosphere is a unit of pressure equal to 101,325 pascals (Pa), the base unit for pressure. Standard sea-level atmospheric pressure defined as 101,325 Pascals. [1]
The standard atmosphere is classified as a standard unit of pressure. Atmospheres can be abbreviated as atm; for example, 1 standard atmosphere can be written as 1 atm.
When working with atmospheres (atm) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, atmospheres (atm) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Megapascal?
A megapascal is a unit of pressure equal to 1,000,000 pascals (Pa), the base unit for pressure. Equal to 1,000,000 Pascals (identically 1 N/mm²). [2]
The megapascal is classified as an International System of Units (SI) unit of pressure. Megapascals can be abbreviated as MPa; for example, 1 megapascal can be written as 1 MPa.
In the metric system, "mega" is the standard SI prefix for millions, or 10⁶. This makes the megapascal (MPa) a convenient decimal multiple of the pascal (Pa).
In practice, megapascals (MPa) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting pressure between atmospheres (atm) and megapascals (MPa), keep full floating-point precision (1 atm = 0.101325 MPa; 1 MPa = 9.8692327 atm) during intermediate calculations and round only the final megapascal figure to match your instrument tolerance.
More Standard Atmosphere & Megapascal Conversions
Need to calculate in the opposite direction? Use our megapascals to atmospheres calculator to switch your starting unit immediately. You can also explore related tools such as converting megapascals to atmospheres, converting psi to megapascals, or converting pascals to megapascals.
Convert from Atmospheres
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — Atmospheres (atm) to Megapascals (MPa)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Standard Atmosphere (atm) & Megapascal (MPa)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (atm to MPa)