The visible part of the clitoris, the glans, is roughly 5 millimeters long and 3 to 4 millimeters wide, about the size of a small pea. But that tiny external tip is only a fraction of the full structure. The entire clitoris, including its internal components, stretches 3.5 to 4.25 inches long and about 2.5 inches wide, making it comparable in size to a flaccid penis.
What You See Is the Smallest Part
The glans, the small rounded nub visible beneath the clitoral hood, is the only externally exposed portion. In a study of 200 premenopausal women, researchers measured the glans at an average of 5.1 millimeters long and 3.4 millimeters wide. Some earlier estimates place it slightly larger, around 1 to 1.5 centimeters in length, reflecting how much natural variation exists from person to person.
MRI studies show even more variability. In one imaging study of women who had never given birth, the glans ranged from 5 to 12 millimeters in length, meaning the largest measured more than twice the size of the smallest. There is no single “normal” size, and differences this wide are completely typical.
The Internal Structure Is Much Larger
Below the surface, the clitoris extends deep into the pelvis with several distinct components. The body (sometimes called the shaft) sits just behind the glans and runs an average of 18 millimeters long, though MRI measurements range from 9 to 24 millimeters. It’s the central column of the organ, made of the same type of erectile tissue found in the penis.
From the body, two legs called crura branch out like a wishbone, curving backward along the pelvic bone. These are the longest part of the clitoris, averaging 36 millimeters each, with a range of 23 to 54 millimeters. Two bulbs of erectile tissue sit on either side of the vaginal opening, flanking the urethra. These bulbs alone have an average volume of nearly 5,000 cubic millimeters, and the whole clitoris averages about 10,000 cubic millimeters in total volume. That said, volume varied enormously across study participants, with some women’s total clitoral tissue measuring nearly twice the size of others.
When aroused, the bulbs swell with blood and can double in size, which is part of what creates the sensation of fullness and increased sensitivity during sexual arousal. The entire erectile tissue complex projects 3 to 6 centimeters outward from the pelvic bone, not lying flat against it as older anatomy diagrams often showed.
Why the Full Size Was Unknown for So Long
For most of medical history, anatomy textbooks either ignored or dramatically underrepresented the clitoris. The landmark work that changed this came from Australian urologist Helen O’Connell, who published detailed dissection studies in 1998 and 2005. Her research demonstrated that the bulbs of erectile tissue near the vaginal opening were actually part of the clitoris, not separate structures. She also showed that the clitoris, urethra, and vaginal wall form a densely packed complex, with erectile tissue surrounding the urethra in almost every direction.
O’Connell’s team recommended renaming the “bulbs of the vestibule” to the “bulbs of the clitoris,” since their connection to the rest of the clitoral structure was far more consistent than their relationship to the vaginal opening. This reframing roughly doubled the understood size of the organ and reshaped how surgeons approach procedures in the area.
Nerve Density Relative to Size
What makes the clitoris remarkable isn’t just its size but the concentration of nerve fibers packed into it. A 2022 study from Oregon Health & Science University counted the nerve fibers in the dorsal clitoral nerve, the primary sensory nerve of the glans. Researchers found an average of about 5,140 fibers per side, bringing the estimated total for the dorsal nerve alone to over 10,000. Because the clitoris also has additional smaller nerves beyond this main one, the true total is even higher.
For perspective, the glans of the clitoris concentrates more than 10,000 nerve fibers into a structure smaller than a fingertip. This makes it the most nerve-dense structure in the human body relative to its size, which is why even small changes in tissue thickness or blood flow can noticeably affect sensation.
How Size Changes Over a Lifetime
The clitoris responds to hormonal shifts throughout life. During puberty, rising estrogen levels cause the erectile tissue to grow along with other genital structures. The organ reaches its full adult size sometime after puberty and remains relatively stable through the reproductive years, though arousal patterns and sensitivity can shift.
After menopause, declining estrogen and progesterone levels cause the surrounding tissues to thin, a process called urogenital atrophy. The clitoris doesn’t disappear, but it can become smaller as blood flow decreases and the tissue loses volume. This same thinning can change how stimulation feels, sometimes reducing sensation and, in some cases, making previously pleasurable contact uncomfortable or even painful. These changes are gradual and vary widely between individuals.