Convert between megapascals (MPa) and pounds per square inch (psi) in either direction.
How it works
One psi equals exactly 6894.757293168 pascals, so 1 MPa = 145.037738 psi. Enter a value in either field and the other updates instantly.
What this does not include
This is a general pressure conversion. For pressure readings tied to a specific gauge or standard (like tire pressure specifications), always check the units your source actually used before converting.
How to use this calculator
- Enter a value in MPa or psi.
- The other field updates automatically.
Where is MPa commonly used instead of psi?
MPa is the standard pressure unit in most metric-system engineering contexts — concrete strength ratings and hydraulic system specifications in much of the world are given in MPa, while the US commonly uses psi for the same measurements.
How does MPa relate to bar, another metric pressure unit?
1 MPa = 10 bar exactly, since a bar is defined as 100,000 pascals and a megapascal is 1,000,000 pascals.
Why isn’t 1 MPa a round number of psi?
Because psi is defined from the pound-force and inch, units with no clean metric relationship to the pascal — the conversion factor is exact but not tidy.
