Dear Maria,

You can calculate your molecule by any program such as Arguslab (free download) then transfer the output file to Molden (free download). You can view the molecule by Molden in which you have an option to view the surface area of the molecule as a cylindrical shape with x,y,z dimentions.

Good luck

Dear Prof Karaman, 

many thanks for your quick response. I downloaded Molden but cannot import my file. from the molden control i click "Read" and double click on my .mol2 file but nothing happens. I m not familiar with such programs....

For Molden to read files, the file should be an output file from another calculations program such as xxxxx.out.

Please try to convert your output file to xxx.out

Good luck 

ok, thank you!