That looks like a decent calculator Defiance. Is the site itself safe? We have had several issues with another site that we no longer allow people to link to. It was infecting machines with viruses.
As I said, it looks to be useful if it is safe to use. The more help we can give other members, the better I like it.
The other site will never get a direct link from here because we have it set up in the forbidden words filter to substitute numbers and # signs. That way we minimize the impact to our members from that site.