Tim, U of IL has good spreadsheets. I believe they're used by many farmers/insurance salemen across USA. If you'd rather not download a spreadsheet (I believe it needs Excel), you can use the U of IL version of same program right on their website. Might be faster for you if you're only going to do 1 or 2 farms or queries. I believe it's the same info as their downloadable spreadsheet. Here's link to website "what-if". No download necessary: http://www.farmdoc.uiuc.edu/cropins/cropinstoolsmain.asp?num=4 | 
Crop Insurance (What If?) Spread Sheet??
