What is the size of prostate in volume?

The size of the prostate gland can vary depending on a man's age and overall health. On average, the prostate gland of an adult male is about the size of a walnut, or approximately 20-30 cubic centimeters (cc) in volume. However, it can grow larger as men age, especially if they have benign prostatic hyperplasia (BPH), a non-cancerous enlargement of the prostate gland.