Megapascals (MPa) to Pounds per square inch (psi) Conversion
Megapascals
The megapascal (MPa) is a unit of pressure equal to exactly 1,000,000 pascals (10⁶ Pa) and is the standard unit for expressing material strength, hydraulic system pressure, and structural loading in engineering. The tensile strength of structural steel is approximately 400–600 MPa; high-strength carbon fibre composites can exceed 3,500 MPa. Hydraulic systems in heavy machinery operate at 20–70 MPa. In geology, lithostatic pressure in the Earth's crust is measured in MPa and GPa.
Pounds per square inch
Pounds per square inch (psi) is a unit of pressure defined as one pound-force per square inch (approximately 6,894.76 Pa). It is the standard for tyre pressure, hydraulic systems, and gas cylinders in the United States. Standard atmospheric pressure is approximately 14.696 psi. In engineering, gauge pressure (psig — relative to atmosphere) is distinguished from absolute pressure (psia — relative to a perfect vacuum), a distinction critical in thermodynamics and fluid system design.
| Megapascals (MPa) | Pounds per square inch (psi) |
|---|---|
| 0.1 MPa | 14.5038 psi |
| 1 MPa | 145.0377 psi |
| 2 MPa | 290.0755 psi |
| 3 MPa | 435.1132 psi |
| 5 MPa | 725.1887 psi |
| 10 MPa | 1,450.3774 psi |
| 20 MPa | 2,900.7548 psi |
| 30 MPa | 4,351.1321 psi |
| 50 MPa | 7,251.8869 psi |
| 100 MPa | 14,503.7738 psi |
| 1000 MPa | 145,037.7377 psi |
Frequently Asked Questions (FAQ)
How many pounds per square inch are in 1 megapascals?
1 megapascals (MPa) is exactly 145.038 pounds per square inch (psi).
How do I convert megapascals to pounds per square inch?
Multiply the value in megapascals by 145.038 to get the result in pounds per square inch. Or use the converter above — type any number and see the result instantly.