1 psi (pound per square inch) equals 0.00689476 MPa (megapascals). To convert psi to MPa, multiply the pressure value in psi by 0.006895. To convert MPa to psi, multiply by 145.038.
This conversion is used constantly in structural and civil engineering, where US specifications use psi and ksi while international standards use MPa and kPa.
The psi to MPa formula
MPa = psi × 0.006895
For the reverse conversion:
psi = MPa × 145.038
Conversion table: psi to MPa
| psi | MPa |
| 1 | 0.0069 |
| 100 | 0.689 |
| 500 | 3.447 |
| 1000 | 6.895 |
| 2000 | 13.790 |
| 3000 | 20.684 |
| 5000 | 34.474 |
| 10000 | 68.948 |
When do engineers convert psi to MPa?
Structural engineers convert psi to MPa when working with international codes such as Eurocode or when comparing US specifications with metric designs. Concrete compressive strength is specified in psi in the US (typically 3000–5000 psi) and in MPa internationally (20–35 MPa). Steel yield strength is commonly 36 ksi or 50 ksi in the US, equivalent to 248 MPa and 345 MPa respectively.
psi, ksi and MPa in structural engineering
In US practice, pressure and stress are measured in psi (pounds per square inch) or ksi (kilopounds per square inch, where 1 ksi = 1000 psi). The SI equivalents are pascal (Pa), kilopascal (kPa), and megapascal (MPa). The relationship between these units:
1 psi = 0.006895 MPa
1 ksi = 6.895 MPa
1 MPa = 145.038 psi
1 MPa = 0.145 ksi
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