this simple application is built for simple and quick conversion of a given amount that includes vat and extract the vat amount to give you an amount without vat and the opposite

returns an amount with vat included
returns an amount without vat included
adjust vat rate, current range (0-52)%

IE 9 and above
not using IE? your good to go.

pull the branch to your local dir and your good to go.
for server installation, same thing. copy the files you just pulled from your local dir and place them to your webserver directory.