Anatomy General f2ad33e1 Normal volume of adult testis A 5-10 ml B 10-15 ml C 15-20 ml D 25-30 ml High-Yield Explanation Ans. is 'c' i.e., 15-20 ml"Normal adult testicular volume is 15-20 ml, calculated by the formula : length x width x depth x 0.52 = volume" -- Grainger.