I'm not aware of one. Sheldon Brown's site breaks down the size matrix pretty well, but I don't think it has anything that ties it to width and overall size.
Overall diameter is a factor of width. Even though, for example, a 26x2.3, 26x2.125, 26x1.95 and 26x1.75 all fit the same 599 mm rim, their widths are obviously different. Their outside diameter is different too, since the tire is more or less a balloon with a round cross section, generally, and it's height on the rim is roughly equal to how wide it is, within reason. Rim width will influence the outcome; a wider rim will make a wider, but shorter cross section, while a narrower on will lead to a narrower contact patch and taller tire. Just like on a car tire/wheel.
I've got a spread sheet that I created that has a row for each major rim diameter, lets you input a tire width, and in turn gives you the approximate overall diameter. It also calculates speed of that tire for a given crank cadence, with that and gear numbers you input. I'm sure someone could clean it up and make it so you can pull down a rim diameter and it'll calculate the rest and display only the pertanent information, but I like having all the sizes layed out so I can see them. Anyway, if you PM me your email, I can send it to you. The offer's open to anyone that might be interested. This sort of thing out to be posted where people can use it.
