Prostate size chart:
your number, decoded
Somewhere on your ultrasound or MRI report is a number: 38 cc, 62 grams, 110 cc. Nobody sat down and explained it. Here is what the number means, how it compares to everyone else's, and, most usefully, which treatments fit which size. One note up front: cc and grams are interchangeable here, because prostate tissue weighs almost exactly what water does.
Medically reviewed by Hari Sawkar, MD, board-certified urologist · Updated August 2026
The chart
Sizes are approximate and the everyday comparisons are just that, comparisons. What each row really tells you is how the conversation usually changes as the number climbs.
| Volume (cc ≈ grams) | Everyday size | What it usually means | Treatments that fit |
|---|---|---|---|
| Under 25 cc | A walnut | The typical baseline for younger men. Urinary symptoms at this size are usually not about volume. | Evaluation looks at the bladder, the bladder neck, and habits before blaming size. |
| 25–40 cc | A golf ball to an apricot | Mild enlargement, extremely common from the 50s on. Symptoms depend more on shape than size. | Medication, UroLift, or Rezūm when symptoms warrant; watchful waiting is often fine. |
| 40–80 cc | A lemon | Moderate enlargement, the range where most men finally get bothered enough to act. | The full menu: UroLift, Rezūm, PAE, and Aquablation all do their best work here. |
| 80–150 cc | An orange | Large. Office procedures pass their design range, and retention risk starts climbing. | PAE and Aquablation; laser surgery (HoLEP) for some anatomies. |
| 150+ cc | A grapefruit | Very large. Historically this meant open surgery; today it usually does not. | PAE has no practical size ceiling; HoLEP remains the surgical answer when needed. |
General patterns, not a verdict. A measured volume plus a symptom score is what turns this chart into your plan.
Normal prostate volume by age
The prostate starts near 20 cc in a man's twenties and grows for the rest of his life, so normal is a moving target. These are typical ranges, and sitting above them is common rather than alarming: roughly half of men in their sixties and the large majority in their eighties have measurable enlargement.
| Age | Typical volume | Worth knowing |
|---|---|---|
| 20s–30s | 15–25 cc | The walnut-sized baseline. Enlargement at this age is uncommon and worth a closer look. |
| 40s | 20–30 cc | Microscopic growth has usually begun; noticeable symptoms are still unusual. |
| 50s | 25–35 cc | Enlargement becomes common; night trips and slower streams typically start here. |
| 60s | 30–45 cc | About half of men have measurable BPH; bothersome symptoms bring most who seek care. |
| 70s | 35–50 cc | A 40 cc prostate at 70 is ordinary. Whether it obstructs is what matters. |
| 80s+ | 40 cc and up | The large majority have enlargement; treatment decisions weigh health more than age. |
Population patterns from imaging and autopsy series, rounded for usefulness. Your measured volume, not your birthday, is the number that drives decisions.
What size of prostate is dangerous?
No volume is dangerous by itself; men live comfortably with 100 cc glands. The danger is never the size, it is what obstruction quietly does over time: urine the bladder cannot empty, infections and stones that breed in it, a bladder muscle that stretches and weakens, and, in the worst cases, pressure backing up toward the kidneys. That risk climbs meaningfully above roughly 80 cc, which is also where office procedures pass their design limits.
The practical translation: a prostate at 80 cc and beyond deserves evaluation even when symptoms feel manageable, because men adapt to slow decline until retention forces the issue. The warning signs that turn someday into soon are listed here, and a post-void residual scan takes seconds to check the quiet ones.
Size is not destiny
The most important fine print on any prostate size chart: symptoms do not track volume in a straight line. A 35 cc gland with a median lobe pressing into the bladder can obstruct worse than an 80 cc gland that grew outward. Some men with huge prostates urinate fine; some men with mild enlargement are miserable.
That is why no honest urologist treats a number. Size decides which treatments are on the menu; your symptoms, your bladder, and your goals decide whether to order anything at all.
How the number is measured
Prostate volume comes from imaging, not the finger exam. A digital exam can tell a walnut from an orange, but it routinely underestimates true size, which is why "your prostate feels fine" and a 90 cc measurement can both be true.
The math, for the curious: imaging measures the gland in three dimensions, and volume is length × width × height × 0.52, the formula for an ellipsoid. Your gland is not a perfect ellipsoid, which is why two scans can disagree by a few cc. Do not sweat small differences.
In-office ultrasound
A few minutes, no preparation, done at the consultation. This is how most men learn their number for the first time.
MRI, often already done
If you have had a prostate MRI for a PSA workup, your volume is already in that report. Bring it; it counts.
Growth over time
The prostate grows roughly 1 to 2 percent a year on average after 40, faster for some men. A number from five years ago is history, not data.
What to do with your number
Pair the volume with how you actually feel, and the path usually gets obvious.
Under 40 cc and bothered
Start with the two-minute symptom score and an evaluation. Office options like UroLift and Rezūm shine at this size, if treatment is warranted at all.
40 to 80 cc
Every modern option fits. Compare all four and let anatomy and recovery preferences break the tie.
80 cc and up
Skip the office-procedure conversation; it mostly does not apply. Read the honest options for large prostates instead.
Any size, pills fading
If Flomax or its cousins have stopped carrying the load, see what replaces them, from smarter pills to one-time fixes.
Common questions about prostate size
Is prostate size measured in cc or grams
Both, and for practical purposes they are the same number. Prostate tissue is almost exactly the density of water, so a 60 cc prostate weighs about 60 grams. Ultrasound and MRI reports usually say cc or mL; pathology reports say grams.
What is a normal prostate size
Roughly 20 to 25 cc in a younger man, about the size of a walnut. The gland grows slowly with age, so a 40 cc prostate in a 70-year-old is common. Normal is less about the number than about whether the gland is blocking flow.
At what size does a prostate need treatment
There is no size that requires treatment by itself. Symptoms and how well the bladder empties make that call; size mostly decides which treatments fit. A 100 cc gland causing no trouble can be watched, while a 35 cc gland with a median lobe can need fixing.
Is a 100 cc prostate dangerous
Not by itself, but glands that size carry a higher risk of urinary retention, infections, and gradual bladder damage, and they sit beyond the design range of most office procedures. At 100 cc the realistic fixes are PAE, which has no size ceiling, and Aquablation. Both avoid open surgery.
Can a large prostate shrink
Yes, three ways. Prostate artery embolization shrinks the gland by roughly a third over three to six months. Finasteride and dutasteride shrink it about a quarter over six months or more. And Rezūm causes treated tissue to be reabsorbed over several months. Which fits depends on your size, symptoms, and goals.
What is the normal prostate size at age 70
Around 35 to 50 cc is typical at 70, up from the 20 to 25 cc walnut of a man's thirties. Growth with age is expected; what matters is whether size or shape is blocking flow, which a symptom score plus a quick bladder scan sorts out in one visit.
Turn the number into a plan
An in-office ultrasound takes minutes and pairs your true volume with a symptom score, which is everything needed for an honest recommendation. Same-day and next-day appointments, telehealth available, Medicare and most PPO plans accepted. For the fastest response, send the office a secure message; the reply comes back by text.
Chief of Urology, Providence St. Joseph Hospital · UroLift Center of Excellence · Orange County's highest-volume Aquablation surgeon