You can spend $20/30 bucks and buy one or search the internet for Boone and Crocket Whitetail scoring and down load the .PDF file that gives you a scoring sheet. Then all you need is some string and measuring tape and a few minutes of playing with that big rack. I scored my first decent buck last fall at 150 5/8 gross and netted out to 146 5/8. Not too bad a 10 point for a non high fence Texas hill country buck.