The cervix is positioned at the end of the vaginal canal, and the distance from the vaginal opening to the cervix (often referred to as cervix height) typically ranges from about 4.5 to 5.5 centimeters (1.8 to 2.25 inches) on average. More broadly, the cervix lies approximately 7.5 to 15 centimeters inside the vagina, with variability depending on the individual. In summary:

• The cervix is the lower part of the uterus protruding into the vagina.
• The average cervix height (distance from vaginal opening to cervix tip) is about 4.5 to 5.5 cm (1.8 to 2.25 inches).
• The vaginal canal length leading to the cervix can range approximately 7.5 to 15 cm (3 to 6 inches).

Thus, the cervix is generally around 4.5 to 5.5 cm inside from the vaginal opening but can be somewhat deeper depending on the individual and physiological factors.