Checkout the following hash calculator. You can compute hash on files with ease. Several has values could be computed: MD5, SHA1, SHA256, SHA384, SHA512. Nice software.
http://www.nirsoft.net/utils/hash_my_files.html
Filename: http://www.nirsoft.net/utils/hashmyfiles.zip
A note about hashing:
Usually, the files on the web may get hacked by some attackers. It is always good to compute the hash value of the files you upload to the net. Any changes to the file will automatically result in a different hash value. Hashing is a one-way process. You can't synthesize the contents of a file by looking at the desired hash value!! It is extremely difficult and almost impossible without some super computing.