Aim: To assess the accuracy of placental thickness measurement as a new parameter for estimating gestational age of the fetus and also to assess the growth pattern of placenta with advancing gestational age. Material & methods: The prospective cross-sectional study consisting of 200 normal antenatal women attending in the Department of Radiodiagnosis, National Institute of Medical Science and Research, NIMS University, Jaipur for the period of one year. Placental thickness was measured as a parameter for estimating gestational age of the fetus from 11 weeks to 40 weeks of gestation by using grey scale real time ultrasonographic examinations. The gestation age was determined by measuring the biparietal diameter, the abdominal circumference, the crown rump length, the head circumference and the femur length. Descriptive statistical analysis has been carried out in the present study. Correlation was inferred by Pearson’s Correlation coefficient. P-value < 0.001 was taken as significant.