I have not tried to convert many, but I believe it is not really as simple as converting - depending on your form that is. If you have a lot of complicated javascript, hidden fields, signatures, etc then I believe the form will need tweaking. Most browsers support opening and running a PDF in situ, so you could just design a submit function into the website to submit the form when the user fills it in. That may be the most direct route.
Acrobat Pro has an Export to HTML utility built in, but it does not work (to my experience) if you have certain code built in. I used it to convert a "static" page with no input fields, but my dynamic pages with all the cool bells and whistles did not convert at all.
Jim