Another factor that will shift this height is if you choose to use a double rod system in your closet.
Double rod closet height.
Continue measuring up the wall to a height 84 inches.
Double rod closets are intended to be used for hanging shirts and pants which are generally less than 40 inches long.
If you are installing dual rods in the closet the hanging measurements and spacing changes.
In a closet that has double closet rods the typical heights of the rods are between 38 40 inches to center from the floor on the lower rod and 76 80 inches to center from the floor on the upper closet rod.
This is the location for the bottom hanging rod.
Make this a full 80 1 4 inches above the ground which is high enough to hang two levels of clothing with 40 inches in between.
The standard height dual closet rods.
For a single rod closet the standard rod height is 66 5 inches.
Double rod systems put this extra space to use with an additional rod mounted a few feet below the top rod.
If installing a double rod closet system mount the top rod 81 inches above the floor.
For a double rod closet the standard height of the top rod is 81 75 inches from the floor and the standard height of the bottom rod is 40 5 inches.