before beginning you must know your precise height (in metres), for this you can visit a professional or find out for yourself, should you choose the latter there are easy to follow instructions for this following, once you know your height please fill the form on the right of the window, thanks for your interest.
1. quitese los zapatos / take off your shoes

2. coloquese dando la espalda a una pared, cuide que sus talones toquen la misma / put your back against a wall making sure the heels are in contact with it

3. enderese su espalda y alargue la cabeza para crear una línea con su columan lo mas recta posible / get your back and head straight

4. haciendo uso de una escuadra apoyada contra la pared determine el punto mas alto de contacto de esta con su cabeza, haga una marca en ese punto / with a triangle ruler against the wall find the highest point of contact of it and your head, make a mark

5. con una cinta métrica tome la medida entre el piso y la marca / measure the distance between the floor and the mark

6. tome nota de esta medida / take note of the number