There are limitations to all the formulas and methods. Because the formulas as apply to as wide a range of people as possible, they cannot be highly accurate for every single individual. The formulas factor only height and gender, and there are no considerations for physical handicaps, people on the extreme ends of the spectrum, activity levels, or muscle mass to body fat ratios, otherwise known as body composition. Our Ideal Weight Calculator is used as a general guideline based on popular formulas, and its results are not intended as strict values that a person must achieve to be considered an ideal weight. Remember that the values found with our ideal body weight calculator are not one hundred percent valid for all. As long as you are in the BMI normal weight range, you are fine - don't go on a strict diet just to reach that specific number. Also, our IBW calculator is valid for adults only. Don't use it to find the proper weight range of kids - consult a specialist instead. Also, don't use it if you are pregnant.