Background: Fetal biometric measurements of different anatomical structures are valuable in radiological and obstetric practice for the estimation of gestational age, assessment of intrauterine growth and differentiation of normal from abnormal fetuses. Birth weight estimation also depends on different fetal biometric measurements and has tremendous value for neonatal management in terms of appropriate time of delivery, specific obstetric interventions and delivery under intensive neonatal care support. Material and methods: Present study was a descriptive study carried out on 500 pregnant women coming to OBGY department were referred to department of radiodiagnosis for antenatal ultrasound for the first time or for follow up scan were enrolled for the study. Results: On outcome of disease, 65% had AGA, 17% had IUGR and 18% had SGA. Mean gestational age in weeks among SGA was 37.97+1.66, IUGR was 35.03+1.18 and AGA was 38.01+1.76. Mean EFBW among AGA was 2954.7+343.5, among IUGR 2390.11+245.9, and SGA was 2546.44+242.5. p value showed high statistical significance. (p<0.0001). Conclusion: Ultrasound biometry is the gold standard for assessment of fetal size. Fetal weight less than 10th percentile for gestational age is mostly used to diagnosis SGA and IUGR but other criteria like elevated HC/AC ratio, elevated FL/AC ratio, and presence of oligohydramnios without ruptured membranes, presence of advanced placental grade can also be used for improving the accuracy of diagnosis.