Pounds per square inch (psi) to Megapascals (MPa) Conversion
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
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 (psi) | Megapascals (MPa) |
|---|---|
| 0.1 psi | 0.000689 MPa |
| 1 psi | 0.00689 MPa |
| 2 psi | 0.0138 MPa |
| 3 psi | 0.0207 MPa |
| 5 psi | 0.0345 MPa |
| 10 psi | 0.0689 MPa |
| 20 psi | 0.1379 MPa |
| 30 psi | 0.2068 MPa |
| 50 psi | 0.3447 MPa |
| 100 psi | 0.6895 MPa |
| 1000 psi | 6.8948 MPa |
Frequently Asked Questions (FAQ)
How many megapascals are in 1 pounds per square inch?
1 pounds per square inch (psi) is exactly 0.006895 megapascals (MPa).
How do I convert pounds per square inch to megapascals?
Multiply the value in pounds per square inch by 0.006895 to get the result in megapascals. Or use the converter above — type any number and see the result instantly.