Here's an interesting link I thought I would share. It's not completely accurate, but according to the site it is within 1-3% of the water displacement tests.
I will have to remember to do this in another month to see if anything has changed, but right now I'm sitting at a comfortable point at about 21-22%. Ideal is 15% according to the experts, guess I have a bit of work to do. In order to get to the ideal weight, I need to lose another 7-8 pounds.