 ## What is the ideal weight/height ratio for a 30+ year old woman?

Weight and body composition are vital factors that influence the risk of developing certain important issues, such as type 2 diabetes, fatty liver disease, stroke, heart disease, osteoarthritis and certain types of cancer.

Healthy body weight can be calculated using various formulas that offer slightly different results. The height and constitution are basic factors in the calculations of the ideal body weight; however, age is not a determining factor in adults.

BMI
The body mass index, or BMI, is a widely used method that determines the range of appropriate weight for a person’s height. A BMI that is between 18,5 and 24.9 is considered normal for women and men. This range corresponds to a lower risk of death compared with a BMI that is higher or lower. According to this method, a normal weight for a 5 feet 8 inches (173 cm) adult is 122-163 pounds (55-74 kg). The midpoint of this range is located approximately to 143 pounds (65 kg), which corresponds to a BMI of 21.7. If your constitution is small, your ideal weight would be at the lower end of the range. Conversely, if you have a big constitution or you own a muscular physique, your ideal weight would be at the upper end of the healthy weight range.

Devine formula
The Devine formula became popular in the 1970s and is still used today as a simple method to calculate the ideal body weight. The calculation for women is 100 pounds (45 kg) for the first 5 feet (152 cm) in height plus 5 pounds (2.3 kg) for each additional inch (1 inch = 2.5 cm). Using the Devine formula, the ideal weight for a woman who is 5 feet 8 inches (173 cm) will be: 140 lbs (63.5 kg), if your constitution is medium; 154 lbs (70 kg), if it is large; and 126 pounds (57 kg), if it is small.

Robinson formula
In 1983, Dr. J.D. Robinson suggested another formula for calculating the weight. For a woman of average build, are mapped 108 pounds (49 kg) in the first 5 feet (152 cm) tall and 3.75 pounds (1.7 kg) are added for each additional inch (1 inch = 2, 5 cm). Using this formula, for a woman with a height of 5 feet 8 inches (173 cm) the ideal weight is 138 pounds (63 kg). If we have the 10 percent set as the physical constitution, the ideal weight would be 124 pounds (56 kg) if the woman is of small build and 152 pounds (69 kg) if she has large constitution. Although the estimates are different, with Robinson formula the ideal body weight is similar to the Devine formula.

Miller formula
The Miller formula for the ideal body weight was introduced, like the Robinson formula, in 1983. For women of average build, this method allocates 117 pounds (53 kg) to the first 5 feet (152 cm) tall, plus 3 pounds (1.4 kg) for each additional inch (1 inch = 2.5 cm). The ideal body weight for a woman 5 feet 8 inches (173 cm) would be 127 pounds (58 kg) for a small build, 141 lbs (64 kg) for the medium and 155 pounds (70 kg) for the largest. 