Background: Ultrasound estimation of fetal weight is a highly influential factor in antenatal management, guiding both the timing and mode of delivery of a pregnancy. The primary goal of this research was to compare the accuracy of 7 different sonographic formulae in estimation of fetal weight at term to show the most accurate formula and obtain the most effective fetal parameter. Methods: This comparative cross-sectional study was conducted at Benha University Hospital and included 120 pregnant women aged between (20 - 40 years) without any chronic diseases at term pregnancy (37- 40) weeks within one day prior to delivery, the ultrasonic study was done to estimate of Fetal weight. Results: Actual birth weight mean value at time of delivery was 3.16 kg. Mean levels of predicted weights using Formulae was 3.46 kg for warsof, 3.01 kg for vintzileos, 2.85 kg for hadlock I, 2.81 for hadlock II, 2.83 kg for hadlock III, 2.96 kg for hadlock IV and 2.83 kg for shepard formula. Spearman correlation was carried out to predict Formulae in significant correlation with log 10 actual birth weight. Actual birth weight has a significant positive correlation with vintzileos and hadlock IV Formulae. Linear regression analysis was conducted between actual body weight and Formulae results for prediction of accurate birth weight. Vitzileos and hadlock IV results were significantly associated with accurate birth weight. Conclusions: Vintzileos and Hadlock IV formulae were found to be significantly associated with accurate birth weight, while Warsof formula showed overestimation.