Stand barefoot on a flat floor against a flat wall
Remove shoes, hats, and bulky hair accessories
Keep your heels, buttocks, shoulders, and head touching the wall
Look straight ahead with your chin level
Place a flat object, such as a book, on top of your head
Mark the wall where the bottom of the object meets the wall
Measure from the floor to the mark using a tape measure
Use a hard, level surface for the most accurate result
Measure in the morning for the most consistent height
Ask someone else to help for better accuracy
Repeat the measurement to confirm the result