Stand straight against a flat wall with your heels, back, and head touching it
Remove shoes and bulky hair accessories
Keep your feet flat and together on the floor
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 object meets it
Measure from the floor to the mark using a tape measure or ruler
Use a stadiometer if available for more accurate measurement
Measure at the same time of day for consistency
Repeat the measurement to confirm accuracy