I'm looking to determine with as much accuracy as possible (without buying specialized equipment) the fat percentage of ground beef.  Is anyone aware of a method that will get me reasonably close?  I found some ideas over here but I'm not confident that any of them are terribly accurate (save the one with the calorimeter.)  http://ask.metafilter.com/152910/A-way-to-test-the-fat-content-of-minceground-beef-at-home 
 Weigh the ground meat before starting to determine its total weight. Render as much fat as possible in the ground meat by boiling or simmering. Use a fat separator to separate off the fat Allow the fat to dry (or dry it by gently bringing to >100°C/212°F, beware splattering). Weigh the amount of fat rendered.   Fat percentage is 100 × (fat weight) ÷ (total weight).  Alternative method: Ask farmer which primal cut the meat is ground from. Look up answer in table. :-P 