Newtons per square meter to millipascals conversion calculator shown above calculates how many millipascals are in 'X' newtons per square meter (where 'X' is the number of newtons per square meter to convert to millipascals). In order to convert a value from newtons per square meter to millipascals (from N/m² to mPa) just type the number of N/m² to be converted to mPa and then click on the 'convert' button.