The most common way to determine 6’ 4″ ideal weight is to look it up on a BMI chart, but some tables do not include 6 foot 4 inchs.
A healthy BMI for someone 6′ 4” is between 152 pounds and 205 pounds. The BMI does not give different ideal weights for men and women.
BMI is currently what is used by the cdc and other health related agencies
Other formulas for choosing ideal weight are:
Ideal Weight for Women 6’ 4″
Robinson Formula - 168pounds is ideal weight for a woman
Devine Formula - 181 pounds is ideal weight for a woman
Miller Formula – 165 pounds is the ideal weight .
Ideal Weight for Men 6’ 4″
Metropolitan Insurance – (small frame 162 – 176 pounds) (medium frame 171– 187) (large frame 181– 207)*
Robinson Formula – 181 pounds is the ideal weight for men
Devine Formual – 191 pounds is the ideal weight for men
Miller Formula – 173 pounds is the ideal weight for men
* Weight in pounds, based on ages 25-59 with the lowest mortality rate
(indoor clothing weighing 3 pounds and shoes with 1″ heels) Metropolitan Insurance 1943