Can we get a better definition on the scope and intended goal of this project? As of right now, honestly, while it's all well and good, it really seems like pushing to standardize something that doesn't need standardization. Every website should already have easily readable output for its tools, or it isn't doing a very good job at being a website.
So, what's really to be gained by investing this time in making a standard for all this information that's already well-formatted? It's certainly not a bad idea for a given website to standardize the output of all their tools, maybe even work something into their own forums to make it pretty, sure. But working to standardize things from one website to another is not only difficult to orchestrate, but what purpose does it serve? It's a rather strange expectation to say that a user might use Site A's calculator to determine this hidden value, but then run off to Site B instead for another hidden value, rather than just use Site A's tool for that one as well.
If this actually takes off, we'll be glad to participate in the process and implement the eventual goal, but what are we really working towards here, and is it something that's actually worth the time and effort it would take to get there? If the goal isn't universally implemented, would this project be considered a success or a failure? What data, exactly, are we proposing a standard for, and what would this standardized output be used for? These are all things which should be clearly defined before any work on standardization actually begins.