Megapascals to PSI Converter
Enter the pressure in megapascals below to convert it to psi.
Convert Megapascals to PSI
Enter a value in megapascals (MPa) to convert to psi (psi).
Megapascal to Pounds per Square Inch Conversion Table
Table showing various megapascal measurements converted to psi. Click any preset value or arrow to load it into the converter.
| Megapascals (MPa) | PSI (psi) |
|---|---|
| 1 MPa | 145.0377377 psi |
| 2 MPa | 290.0754755 psi |
| 5 MPa | 725.1886887 psi |
| 10 MPa | 1,450.3773773 psi |
| 12.5 MPa | 1,812.9717216 psi |
| 15 MPa | 2,175.566066 psi |
| 20 MPa | 2,900.7547546 psi |
| 25 MPa | 3,625.9434433 psi |
| 30 MPa | 4,351.1321319 psi |
| 50 MPa | 7,251.8868865 psi |
How to Convert Megapascals to PSI
To convert megapascals to psi, multiply the pressure by the following conversion ratio: 145.0377377 psi/megapascal.
Since one megapascal is equal to 145.0377377 psi, you can use this simple formula to convert:
The pressure in psi is equal to the pressure in megapascals multiplied by 145.0377377.
For example, here's how to convert 25 megapascals to psi using the formula above.
How Many PSI Are in a Megapascal?
There are 145.0377377 psi in a megapascal, which is why we use this value in the formula above.
Our megapascal to pounds per square inch calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Megapascals and psi are both units used to measure pressure. Keep reading to learn more about each unit.
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). [1]
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.
What Is a Pounds per Square Inch?
A pounds per square inch is a unit of pressure equal to 6,894.7572932 pascals (Pa), the base unit for pressure. Imperial & US pressure unit equal to 1 pound-force per square inch (6.89476 kPa). [2]
The pounds per square inch is classified as a US customary and imperial unit of pressure. PSI can be abbreviated as psi; for example, 1 pounds per square inch can be written as 1 psi.
When working with psi (psi) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, psi (psi) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting pressure between megapascals (MPa) and psi (psi), keep full floating-point precision (1 MPa = 145.0377377 psi; 1 psi = 0.0068948 MPa) during intermediate calculations and round only the final pounds per square inch figure to match your instrument tolerance.
More Megapascal & Pounds per Square Inch Conversions
Need to calculate in the opposite direction? Use our psi to megapascals converter (psi to MPa) to switch your starting unit immediately. You can also explore related tools such as converting bars to psi, converting kilopascals to psi, or converting megapascals to pascals.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — Megapascals (MPa) to PSI (psi)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Megapascal (MPa) & Pounds per Square Inch (psi)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (MPa to psi)