To relate the size of your testicle to the Tanner stage of development: Stage 1: (childhood): 1 to 3 milliliters Stage 2: (early adolescence): 4 to 6 milliliters Stage 3: (mid adolescence): 7 to 16 milliliters Stage 4: (late adolescence): 12 to 24 milliliters Stage 5: (adulthood): 16 to 27 milliliters
