Stand on a flat floor against a flat wall
Remove shoes, hat, and bulky hair accessories
Keep heels, buttocks, shoulders, and back of head touching the wall if possible
Look straight ahead with your chin level
Place a flat object like a book on top of your head
Mark the wall where the bottom of the book meets the wall
Measure from the floor to the mark using a tape measure or ruler
Measure in the morning for the most accurate height
Repeat the measurement 2 to 3 times for accuracy
Record the result in inches or centimeters