I do have my own opinion on using calipers for tracking purposes but I'd like to point out something Sassy said. "Their (capilers) accuracy is not 1000% because its a skin fold measure, even the ones the try to eliminate the water aspect of the skin fold. They ONLY measure skin fold. The BodPod / dunk tank measures your body's displacement of water - this allows you to account for internal fat as well - the stuff that is around your organs."
I'm with the guys ^^ about how to use your eye as well as a scale, tape measure, or caliper, and take some progress pics every week or so. Sure it helps to see the #'s decreasing but when a reading comes back that you feel is 'off' when you can visibly SEE changes, and the #'s don't agree, then all the sudden you're crushed & get bent outta shape & take it out on a pint of Ben & Jerry's ... DON'T let that happen.
If you do a search on google you'll find all types of 'calculator's ... b/c you asked, here's a
*LBM Calculator*
You need to find a program that you want to start with training wise, test it out, see how it works for you & your current goals. If you hit a plateau, then change things up, adjust diet, try something knew. But don't bounce around after one week because you feel like something is not working or you're not seeing results.
" This is a marathon not a sprint. "