Stand straight against a flat wall with your heels, back, and head touching it
Remove shoes and any headwear
Place a flat object, like a book, on top of your head at a right angle to the wall
Mark the spot where the bottom of the object touches the wall
Measure from the floor to the mark using a tape measure
Convert inches to feet by dividing the total inches by 12
Write the height in feet and inches, if needed
Example: 66 inches = 5 feet 6 inches