Purpose. Our goal was to establish the range of sonographic measurements of normal gallbladders in children. Methods. Six hundred ten children aged 0-16 years (male:female ratio, 1.5:1) with normal clinical and laboratory findings were included in this study. The sonographic parameters were the length, width, and calculated volume of the gallbladder, and the clinical parameters were the age, height, weight, and body surface area of the children. Statistical significance was determined through correlation and regression analyses. Results. The length of the gallbladder showed significant positive correlations with age (r=0.65), height (r= 0.67), weight (r= 0.63), and body surface area (r= 0.65; p < 0.01). The calculated volume of the gallbladder also showed moderate correlations with age (r = 0.53), height (r = 0.55), weight (r = 0.61), and body surface area (r= 0.57; p < 0.01). The gallbladder width showed modest but significant correlations with age (r= 0.48), height (r= 0.53), weight (r= 0.53), and body surface area (r = 0.55; p < 0.01). The highest correlation coefficients were found between the gallbladder length and subject age (r= 0.65; p < 0.01) and between the gallbladder length and subject height (r= 0.67; p < 0.01). For all correlations, statistical significance remained after regression analysis (p < 0.01). Conclusions. Values for the size of the normal pediatric gallbladder are defined and will be helpful in the diagnosis of gallbladder abnormalities.