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The only real reason to even think in terms of a “normal” or “ideal” body weight is because there is a statistical correlation between your weight and your risk of having certain health problems that can lead to premature death or disability. Although your weight may or may not be the cause of these health problems, it’s clear that people who weigh more—or less—than “normal” are more likely to have these problems.
Experts who study these things have come up with several different methods of estimating your health risks based on your weight and size, as well as a set of calculations that are routinely used to determine whether your weight/size is in the normal range or not. Here are three of the most commonly used calculations:
Body Mass Index (BMI) is simply the number you get when you divide your weight (in kilograms) by your height squared (in centimeters). According to years of health research, the further your BMI deviates from the normal range (whether above or below), the higher your risk for obesity-related health problems (such as diabetes, high blood pressure, high cholesterol, stroke, heart disease, and bone/joint disorders). Calculate your BMI here. Similarly, you can calculate your goal weight and see if it fits in with these ranges. If not, then your expectations might be unrealistic.
Height/Weight Charts, such as the HANWI formula (below), have been around since the 1950's. BMI has pretty much replaced the older height/weight charts as the most common way to assess health risks related to weight. But variations of these charts are still used today as quick and simple ways to estimate the normal weight range for your height. Here's a simple formula you can use: