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Is anybody aware of a jQuery Pro Rata Wheel? I checked the usual places but couldn't find anything.

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Do you mean a plugin? I doubt anyone would bother. Judging by this calculator, it's just a bunch of math, with very little that would be particularly "jQuery" about it. At most, they'd build the form manually and just use some .change() binders on the fields rather than the in-line ones. – Su' Feb 11 '11 at 11:06

There's a jQuery Calculation plugin that might be useful here as something to build from.
You can attach it to a group of form fields, with operations related to the set. You'd still have to work out the actual math operations yourself, but it will take care of all the update events and such to keep the "total" field up to date and so on.

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