Answer: The cervix is typically located about 3 to 6 inches (7.5 to 15 cm) inside the vaginal canal, and its depth can vary with arousal and individual anatomy. When not aroused, the cervical canal is generally shorter in practical touch, while arousal causes the vagina to lengthen and the cervix to shift position slightly. A common clinical reference is that the cervix lies within the lower part of the uterus and forms the canal that connects the vagina to the uterine cavity, with measurements often cited around 2 to 4 cm in length for the cervical portion itself, though this can vary by person and parity (whether someone has given birth). For more precise evaluation, a clinician can assess depth and location during a pelvic exam. If you’re asking for measurement guidance for a specific reason (for example, choosing a menstrual cup size or understanding how arousal affects depth), here are practical notes:

• Cervical length is relatively constant across most adults, but the visible depth inside the vagina can feel deeper when aroused because the vaginal walls lengthen.
• A hands-and-fingers method can give you a rough sense of depth: you can gently insert a finger to feel the cervix and note how far your reach extends, keeping nails trimmed and hands clean. This is not a medical measurement but can help in choosing products like cups that come in different sizes.
• If there is unusual pain, heavy bleeding, or a sudden change in sensation or depth, consult a healthcare provider for a professional evaluation.

If you’d like, I can tailor a concise overview to your specific context (e.g., menstrual cup sizing, sexual health education, or anatomy reference) and provide references to reputable sources.