Conversion tool
Convert megapascals to pounds per square inch instantly
Enter a value, see the result, copy it, and save a PDF snapshot.
Input
Type a value, then press Enter to calculate.
Result
0.000 psi
Rounded for readability. Use the arrows to increase or decrease the number of shown digits.
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Disclaimer: Use calculations at your own risk. For critical applications, verify results against your governing standards/specifications.
How it works
We use psi = MPa x 145.03773773.
Exact relationship: 1 MPa = 145.03773773 psi.
Example: 1 MPa = 145.038 psi.
Notes: Results are rounded in the default view.
Examples
- 1 MPa = 145.038 psi
- 10 MPa = 1450.377 psi
- 35 MPa = 5076.321 psi
FAQ
What physical quantity do megapascals and pounds per square inch express?
Megapascals express pressure or stress using SI-derived units at a scale convenient for engineering materials and hydraulic systems. Pounds per square inch express pressure, meaning force distributed over an area rather than a simple force or distance quantity.
What is the difference between megapascals and pounds per square inch?
Megapascals and pounds per square inch both express pressure, but they belong to different technical conventions and are favored in different industries and regional documentation systems.
What is the history of the megapascal?
Megapascals follow directly from the pascal within SI and became standard in engineering disciplines that use metric stress and pressure values.
What is the history of the pound per square inch?
PSI developed from customary force and area units and remains deeply embedded in U.S. pneumatics, hydraulics, tire pressure, and industrial equipment references.
Were the megapascal and pound per square inch discovered by a specific person?
The megapascal is an SI-derived standardized unit rather than a discovery attributed to a single person. PSI was not discovered by a single person; it emerged from established customary force and area units used together as a pressure measure.
Where are megapascals and pounds per square inch used in science and engineering?
MPa is common in material strength data, hydraulic systems, stress calculations, and metric engineering specifications. PSI is common in hydraulics, pneumatics, pressure gauges, compressors, tire service, and U.S.-oriented industrial documentation.
Why do pressure units matter in calculations?
Pressure units affect equipment ratings, seal selection, material limits, safety settings, and process controls. Keeping the unit visible helps prevent dangerous unit mistakes.
Can I trust this for critical calculations?
Use this for convenience and verify against your governing standard, equipment manual, or controlled specification for critical work. Pressure interpretation and safe limits depend on the system context.
References
- Exact constant used: 1 MPa = 145.03773773 psi.
- Pressure conversions are derived from consistent force-per-area relationships anchored to the pascal.