Background: Placenta is a materno-fetal organ, and its size is indicative of the fetus health and growth. Placental thickness (PT) is an additional ultrasonographic metric commonly used to evaluate the placenta.The  objectiveof this study was to assess the relationship between PT (at 32- and 36-weeks of gestation) and to estimate the fetal weight. Methods: This observational study was performed at the Department of Obstetrics andGynecologyBenha University Hospital and ShebeenElkoom insurance hospital over a period from July 2020 to November 2021.Results: There was a significant positive correlation between PTat 32weeks and Apgar score at 1st and 5th min. Also, there was a significant positive correlation between PTat 36 weeks and Apgar score at 1st and 5th min. There was a significant positive correlation between PT at 32 weeks, PT 36 at weeks and femur length(FL), abdominal circumference (AC), biparietal diameter (BPD), head circumference (HC), estimated fetal weight (EFW) and amniotic fluid index (AFI). Conclusion: The evaluation of fetal weight( a vital element of prenatal treatment), relies heavily on ultrasonography(US).PT measured at the umbilical cord insertion point is a reliable sonographic indication for fetal weight evaluation, due to their linear correlation .