Birth weight is an important factor in delivery management. Antenatal ultrasound has turned out to be one of the clinicians' most vital devices for surveying fetal age, growth and prosperity. Contrasted Physical examination of the pregnant uterus is the most precise strategy for evaluating fetal size and growth along with the utilization of ultrasound imaging and estimating of the different fetal parameters. Objective: To evaluates the antenatal assessments of fetal weight in pregnancies by using Johnson's formula, Hadlock's formula and Ultrasonography. Comparison of these different methods with the actual birth weight of these babies after delivered. Material and methods: Two hundred singleton term pregnancies within 48 hours were randomly selected to participate in this prospective cohort study. Variables included such as abdominal circumference, Biparietal diameter, and Femur length. (Parameters to obtain estimated fetal weight) Results: The mean birth weight of Hadlock formula is closest to the mean of actual birth weight. In the study population, more primigravida delivered babies with very low birth weight and more multigravida delivered babies of birth weight > 3500 gms. Johnson's and ultrasound-Hadlock's formula had a marked tendency to overestimate the fetal weight. Error was within 350 Gms in 84.7%, 70.8% and 84% of cases by Dare's, Johnson's and ultrasound-Hadlock's formula.