Just input your date of birth, sex at birth, height and weight, and choose the metric or imperial units that make most sense to you. Then find out:
The chemical ingredients that make up you, and what your body is worth. How many atoms you are made of, and what can be made with them. How many fat, blood, skin and brain cells you have. How many other microbes live on your body with you. The size and weight of your internal organs. How many times you have blinked, breathed, yawned and farted... and much more.