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MPa to PSI Converter.

Convert megapascals to pounds per square inch using the exact SI-to-psi relationship.

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Result: 145.03773773

Result

0.00000000

Use Cases

Engineering and Manufacturing

Quickly convert pressure ratings for materials, hydraulic systems, or pneumatic tools when specifications are given in different units.

Example: A hydraulic cylinder rated at 20 MPa is equivalent to 2,900.75 psi.

Academic and Research Work

Convert pressure values in scientific papers or lab experiments from SI units to imperial units for comparison or reporting.

Example: Convert 0.5 MPa to psi for a physics lab report.

Frequently Asked Questions

How do I convert MPa to psi using this calculator?
Select 'MPa' in the 'Convert from' dropdown and 'psi' in the 'Convert to' dropdown, then enter the value in MPa. The calculator uses the exact conversion factor: 1 MPa = 145.0377 psi.
What is the exact conversion factor between MPa and psi?
1 megapascal (MPa) is exactly equal to 145.0377 pounds per square inch (psi). This is based on the SI definition of the pascal and the pound-force per square inch.
Can I convert psi to MPa with this calculator?
Yes, simply select 'psi' in the 'Convert from' dropdown and 'MPa' in the 'Convert to' dropdown. The calculator will apply the inverse conversion factor (1 psi = 0.00689476 MPa).

Tips & Common Mistakes

Tips

  • Always double-check the direction of conversion: MPa to psi multiplies by 145.0377, while psi to MPa divides by the same factor.
  • For quick mental estimates, remember that 1 MPa is roughly 145 psi, so 10 MPa is about 1,450 psi.
  • Use the calculator for precise conversions, especially when dealing with high pressures where rounding errors can be significant.
  • If you need to convert other pressure units, consider using a comprehensive pressure converter tool.

Common Mistakes to Avoid

  • Reversing the conversion factor: using 145.0377 when converting from psi to MPa instead of dividing by it.
  • Forgetting to select the correct units in the dropdowns, leading to an unintended conversion.
  • Assuming 1 MPa equals 100 psi, which is a common but inaccurate approximation.

Last updated: August 13, 2026