According to the Hamwi method of calculating ideal body weight, females should weigh 100 pounds for the first 5 feet of height and 5 pounds for every subsequent inch, explains PAC-CATS. Males should weigh 106 pounds for the first 5 feet of height and 6 pounds for every inch thereafter.
Using the Hamwi method, a 5-foot, 5-inch woman should weigh 125 pounds. A 6-foot man should weigh 178 pounds. Many doctors use body mass index to provide a wider range of acceptable weights. The National Heart, Lung, and Blood Institute offers an easy-to-use online BMI calculator and a BMI table. To achieve an ideal BMI of 18.5 to 25, a 5-foot, 5-inch woman should weigh from 115 to 145 pounds, and a 6-foot man should weigh from 140 to 180 pounds.