PanaKit's ultrasound due date calculator helps you estimate or check a due date from scan-based gestational age when your clinician has given you measurement data. Runs instantly in your browser, and nothing you enter is stored or sent anywhere.
Complete ultrasound timing fields.
First-trimester crown-rump length (CRL) is often the most accurate single measurement for dating. Later scans use biparietal diameter, head circumference, and other growth markers. Clinics may adjust an official due date when ultrasound dating and LMP-based dating disagree by more than about a week.
Sometimes. IVF dating from your transfer date is usually very precise, but an early growth scan can still refine scheduling if measurements suggest a meaningful difference. Your clinic's official date takes priority.
Often yes in the first trimester, typically within a few days when CRL-based. Accuracy depends on scan timing and measurement quality.