Prostate Volume Calculator: Convert Ultrasound Dimensions to Grams
This prostate volume calculator converts the three measurements from your ultrasound or MRI report into prostate size in grams using the standard ellipsoid formula (length × width × height × 0.52). Knowing your exact prostate volume is critical — it determines which BPH surgeries you qualify for (e.g., UroLift for smaller prostates, HoLEP for large ones) and allows your urologist to calculate your PSA density. Enter your dimensions, along with your latest PSA level and age, to generate your prostate volume, a helpful “fruit size” visual comparison, your PSA density risk score, and a personalized clinical action plan.
This tool converts imaging dimensions into standard urological volume estimations. It does not replace a clinical consultation or prostate cancer screening.
Size Comparison: Walnut
A normal, healthy prostate is about the size of a walnut (15-25g).
Your Personalized Action Plan
Trusted Patient Resources
For more clinical background on prostate enlargement and PSA tracking, these resources are reliable starting points:
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Frequently Asked Questions About Prostate Volume
What is a normal prostate size?
A normal, healthy adult prostate is roughly the size of a walnut and weighs between 15 and 25 grams (or cc/mL). As men age, benign prostatic hyperplasia (BPH) causes the prostate to grow. A prostate between 30 and 50 grams is considered mildly enlarged, 50 to 80 grams is moderately enlarged, and anything over 80 grams is severely enlarged. Learn more about BPH.
Are grams and cubic centimeters (cc) the same?
For all practical urological purposes, yes. Prostate tissue has a specific gravity very close to water (1.0). Therefore, 1 cubic centimeter (cc) or 1 milliliter (mL) of prostate volume equals approximately 1 gram of prostate weight. Ultrasound reports usually give volume in “cc” or “mL,” while surgeons often discuss the removed tissue in “grams.”
How does prostate size affect my surgery options?
Prostate volume is the most important factor in choosing a BPH surgery. Minimally invasive procedures like UroLift and Rezum are generally best for prostates under 80 grams. Standard TURP is ideal for prostates between 30 and 80 grams. If your prostate is over 80–100 grams, HoLEP (Holmium Laser Enucleation) or a robotic simple prostatectomy are the gold standards, as a standard TURP would take too long and carry higher bleeding risks. Use our Surgery Comparison Tool to evaluate your options.
What is PSA Density and why does it matter?
PSA Density is your PSA level divided by your prostate volume. Because benign (non-cancerous) prostate tissue also produces PSA, a large prostate will naturally have a higher PSA. PSA Density helps urologists figure out if your elevated PSA is just from a large prostate, or if there is a higher risk of prostate cancer. A PSA density under 0.10 is very reassuring, while a density over 0.15 often triggers a recommendation for an MRI or biopsy. Learn more about interpreting your PSA levels.
Does a larger prostate mean more severe symptoms?
Surprisingly, no. There is a very poor correlation between prostate size and urinary symptom severity. A man with a massive 150-gram prostate might urinate perfectly fine if the growth expands outward, while a man with a 35-gram prostate might be in urinary retention if a small “median lobe” grows directly into the bladder neck and blocks the flow like a ball valve. Check your symptom severity with the IPSS questionnaire.
Dr. Muhammad Khalid
MBBS · FCPS (Urology) · MCPS (Gen. Surgery) · CHPE · CRSM · IMC #539472
Specialist urologist with 11+ years of clinical experience across tertiary teaching hospitals. Trained at Lady Reading Hospital and Khyber Teaching Hospital, Peshawar. Author of 5 peer-reviewed international publications in Cureus, WJSA, and AJBS. Procedural expertise: URS, PCNL, RIRS, TURP, TURBT, and major open urological surgery. Full profile →
This article is for educational purposes only and does not constitute medical advice. Always consult your physician or urologist for diagnosis and treatment decisions specific to your condition.