To determine the appropriate weight for your age, locate the body mass index calculator on the website of the National Heart, Lung and Blood Institute, enter your height and weight, and compute your BMI. The normal weight for adult men and women falls within the BMI range of 18.5 to 24.9, according to the National Heart, Lung and Blood Institute.
The ideal body weight depends on factors such as height, age, sex, muscle-fat ratio and bone density, states Medical News Today. The body mass index, which measures a person's weight in relation to height, is one of the tools that medical professionals use to determine ideal weight. People with a BMI of less than 18.5 are underweight, while those with a BMI between 25 and 30 are overweight. Health authorities worldwide consider people with a BMI above 30 obese.
The BMI for normal weight increases steadily with age. Whereas a 20-year-old individual with a BMI of 18.5 has appropriate weight, a 55-year-old person with a BMI of less than 22 is underweight, according to Medical News Today. Medical authorities interpret the BMI for children and teenagers differently from that of adults, explains the Centers for Disease Prevention and Control. Clinical growth charts are appropriate for determining the ideal weight of boys and girls below 20 years of age.