Coding for my site

I am constructing a fat loss membership site. one of the facilites that I want to inlcude is a place where my members can: 1. Input their measurements ie weight, height, chest, hip, thigh, and waist and from these measurements my site will calculate their body mass index, their basal metabolic rate, and their bodyfat % 2. I also want a place where they can edit a food diary, exercise diary and regularly upload their photos to track their progress.