Psi to Megapascals
Pounds per square inch is the standard pressure unit for tire inflation and plumbing in the US. A megapascal is one million pascals, used to measure material strength like the tensile strength of steel. 1 psi equals ≈0.00689476 MPa, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to pressure, measured here against pressure's base unit (Pa) — every other pressure unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
MPa = psi × ≈0.00689476
psi = MPa × ≈145.038
Worked example: 5 psi × ≈0.00689476 = ≈0.0344738 MPa.
Conversion table
| PSI (psi) | Megapascal (MPa) |
|---|---|
| 1 psi | ≈0.00689476 MPa |
| 2 psi | ≈0.0137895 MPa |
| 3 psi | ≈0.0206843 MPa |
| 5 psi | ≈0.0344738 MPa |
| 10 psi | ≈0.0689476 MPa |
| 20 psi | ≈0.137895 MPa |
| 25 psi | ≈0.172369 MPa |
| 50 psi | ≈0.344738 MPa |
| 100 psi | ≈0.689476 MPa |
| 250 psi | ≈1.72369 MPa |
| 500 psi | ≈3.44738 MPa |
| 1,000 psi | ≈6.89476 MPa |
Frequently asked
- How many Megapascals in a psi?
- 1 psi equals ≈0.00689476 MPa.
- How do I convert PSI to Megapascals?
- Multiply the value in psi by ≈0.00689476 to get MPa. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — PSI and Megapascal are both defined by a fixed conversion factor to pressure's base unit (Pa), so the result shown is exact to the precision displayed, not an approximation.