How to calculate molecular volume

[Jinsong Zhao <zh_jinsong { *at * } yahoo.com.cn>]

Dear all,
 I hope to know if there is any program or routine
 could calculate the molecular volume with high
 precision and reliability, moreover, to figure out the
 length, width and high of the grid that contain the
 molecule.
 Any comments, suggestion are welcome!
 Thanks for essential responses!
 Best regards,
 Jinsong
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