"Body mass index (BMI) is a number based on height and weight that can help estimate whether someone is at a healthy weight." (Cancer.org) How to calculate your height in inches: Say you are 4'10 (its okay short king) simply multiply your ft (in this case 4 ft) by 12 and add your inches (In this case ten) 4x12+10=58 Inches :) Now plug your data and learn if your fat!