Ultrasound Pregnancy Dating
Estimate gestational age from the crown-rump length (CRL) measured on ultrasound.
Estimated Gestational Age
Estimate from CRL using standard reference curves. Final dating is set by your doctor. Not medical advice.
About ultrasound dating
In early pregnancy, the crown-rump length (CRL) closely matches gestational age.
First-trimester ultrasound dating is more accurate than the period-based estimate.
FertiJourney provides expert ultrasound and prenatal care — get a free consultation.
Ultrasound dating FAQ
Is ultrasound dating accurate?
First-trimester ultrasound is the most accurate way to date a pregnancy.
What is CRL?
Crown-rump length — the baby's length, measured in early ultrasound.
Ultrasound or LMP — which?
Early ultrasound dating usually overrides LMP-based dating.