Pounds per square inch to megapascals converter above calculates how many megapascals are in 'X' pounds per square inch (where 'X' is the number of pounds per square inch to convert to megapascals). In order to convert a value from pounds per square inch to megapascals (from psi to MPa) just type the number of psi to be converted to MPa and then click on the 'convert' button.