Myself, and 2 other people (1 Kong, and 1 Jigg) have created a WotW calculator in Google Docs. You can add a like to it at the top of your guide.
Some of the stuff it does:
- Calculate how many turns it takes before you can upgrade
- Calculate the time it will take to get those turns
- Research Points calculator for you Nation
- Research Points calculator for your personal goals
- Empire Strength calculator
- All costs for buying or selling any building at any level
- Table for all possible repair costs (WIP)
It's possible that the page may be vandalized since anyone can edit it, however I can easily swap out a damaged sheet with a back up copy in 4 clicks.
or the shortened version: http://bit.ly/H3C0Em