When I was busy doing some future planning for my wild territory I ran in to the problem that I had no idea if my plans would be doable money wise. (Of course anything is doable, but I have a limit on what I spend on wild chunks) That's why I decided to make a handy little calculator which lets you calculate the costs for any wild chunk you want. You can enter a chunk number and it will calculate the price of that chunk, the total price of all chunks till that chunk and the total area you will have. You can find the tool here: http://jsbin.com/yawojama/1

Note: The chunk prices listed in this calculator are based on a formula for the chunk pricing which I guessed/calculated. In general it is pretty accurate, although the prices may differ from the real prices slightly, in most cases not more than a couple nbz.

I think the pricing of wild chunks had changed in the recent server update so these values probably aren't correct anymore. I'll try updating it when I have time.