There is an easy to use a ratio for calculating a healthy weight to height. It's called the body mass index (BMI). Your body weight ideally should be within the index ranges based on a number of factors; however, there can be some extenuating circumstances such as pregnancy that could put your weight temporarily out of the range. Your BMI is determined from your weight and height. It provides you with the approximate amount of lean tissue versus fat tissue or an estimate of body fat. You can find BMI charts and calculators online, including the Mayo Clinic's website.