Background: Accurate estimation of gestational (GA) is the basis of vital decisions in pregnancy and hence its importance in obstetric management. Crown rump length (CRL) has been proved to be a reliable parameter for the estimation of pregnancy age especially from 7 to 10 weeks. Additionally, it was demonstrated that, the gestational sac volume (GSV), embryonic volume (EV), CRL are important parameters for the early diagnosis of growth disorders. Objective: The aim of the current work was to assess the correlation of pregnancy outcome with gestational sac volume in relation to embryonic volume at )7‐10) weeks of gestation. Patients and methods: This was a prospective observational cross-sectional study carried out on 100 pregnant women with singleton pregnancy that belonging to7-10 week of pregnancy attending a routine antenatal checkup at Outpatient Clinic Of Obstetrics and Gynecology Department, Mansoura University Hospital. Results: Caesarean section (CS) was the most frequent mode of delivery among the studied cases. The average GSV, EV and CRL were higher among females with higher gestational age. EV and GSV were demonstrated to be significant predictors of CRL. CRL=1.55+0.02*GSV+0.08*EV. GSV was displayed to be a significant predictor of fetal birth weight. Fetal birth weight=2.94+0.008*GSV. Conclusion: It could be concluded that the GSV and EV reference intervals established in the present study can be used as normal parameters in future studies assessing cases at risk for adverse pregnancy outcomes.