To calculate your ideal weight, first measure your height. An average to medium built woman over 21 years old who is 5 feet tall has an ideal weight of 100 pounds. An average to medium built man over 21 years of age who is 6 feet tall has an ideal weight of 170 pounds. For each inch over those heights, add 5 pounds to determine ideal weight.
Women over 5 feet tall multiply the number of inches over 5 feet by five and add it to 100. A woman who is 5 feet, 4 inches tall would multiply four by five and get 20. Her ideal weight is 120 pounds. Women shorter than 5 feet multiply the number of inches below five feet by 5 and subtract the number from 100. A woman who is 4 feet, 9 inches tall multiplies three by five for a product of 15. Her ideal weight is 85 pounds.
The same calculations occur for men but there is a different starting height and weight. A man who is 6 feet, 5 inches tall multiplies five by five for a product of 25. His ideal weight is 195 pounds. A man who is 5 feet, 9 inches tall multiplies nine by five and gets 45. His ideal weight is 125 pounds.
If a person has a more muscular frame or a naturally thin frame, the ideal weight changes. Children, teenagers and pregnant women also have different ideal weight measurements. Always consult a doctor to determine the most healthy weight for you.