Background: Accurate estimation of fetal weight is of importance in the management of labour and delivery. Both low birth weight and macrosomic fetus at delivery are associated with increased risk of newborn complications during labor and puerperium. Two important methods for predicting birth weight in current day obstetrics practice are clinical by Johnson’s formula and ultrasonographic methods. Aims and objective: Aim of the present study is to compare and correlate the effective birth weight obtained by clinical method using Johnson’s formula and ultrasonographically by Hadlock’s formula with actual birth weight. Objective of this study was to access the fetal weight by clinical and Sonographic and to compare the actual weight of baby after birth. Material & Methods: It was a prospective analytic study conducted in Department of Obstetrics and Gynecology at tertiary care hospital SVP hospital; NHL MMC, Ahmedabad from February 2022 to July 2022. The formulas used in study are Johnson’s formula, Hadlock’s formula and the statical method Bland Altman analysis used. Result: This study shows that birth weight calculated by using Symphyiso fundal height and Birth weight with ultrasonographic method shows very negligible difference with actual birth weight. So both methods are equally important. Conclusion: Johnson’s formula used for clinical weight estimation is inexpensive and readily available method done with help of non elastic tape and gives fairly precise results in term pregnancies and helps to recognize irregular fetal growth and diminish adverse perinatal outcome. Though ultrasonography is more accurate but it is costly and special skill also required. So clinical estimation of fetal weight has important role and as an alternative method where ultrsonography is not available.