Stand against a wall and mark the top of your head
Use a book or flat object to create a straight edge at the top of your head
Measure from the floor to the mark with a ruler, yardstick, or measuring app
Use a door frame with known measurements and compare your height
Use a piece of string or cord, then measure the string with a ruler
Use a sheet of paper as a reference unit and count how many fit from floor to mark
Ask someone to trace your height on the wall, then measure later with any straight ruler
Use a smartphone height-measuring app
Compare your height to a known object such as a standard door, refrigerator, or bed frame
Use a shadow and compare it with a known object of the same shadow length
Measure your height against a wall using a level line and any straight-edged item
Use a measuring stick made from stacked paper, books, or other uniform objects
Use your own footprint length as an approximate reference if no tools are available