Migrating .NET Code To A Web-based App?

I come to programming from a school of functionality rather than theory- writing programs to meet a goal or solve a problem.I haven't had any education in computer science so many aspects of the Visual Studio world are alien to me.Just for fun I wrote a very small program to help with a computer game.It's called the All Lucky Sevens calculator for Final Fantasy 7.If you haven't played the game it won't make much sense to you so I'll eschew the logic of why I wrote it, focusing on what it does.

Basically it performs a series of percentage calculations on a number input by the user, trying to convert the original number into one that ends in 77. So 6104 reduced by 7% is 5677 The question is, how difficult is it to convert VB.NET code to work as a web-based app. I thought .NET was designed to make it easier to do this? Is it relatively simple to convert VB.NET code into something that can be run from a website? If not, the solution is to rewrite it in a different language like Java or Flash.The actual programming of it would not be difficult, but I do not speak those languages and it would require rewriting all the nested loops and ifs.Forcing VB to round down a decimal to an integer was difficult enough, I daren't think how hard it is in a language I've never used before.