Pregnancy due date calculator
Estimate your due date from the first day of your last period. This is an educational estimate — your care team confirms dating with a scan.
This tool is educational. Diagnosis and treatment choice must be confirmed by a fertility specialist after reviewing your history and reports.
Common questions
How is a pregnancy due date calculated?
A due date is commonly estimated as about 280 days (40 weeks) from the first day of your last period. It's an estimate — only around 1 in 20 babies arrive on the exact date. Your care team confirms dating with an early ultrasound scan.
Is the due date from my last period accurate?
It's a useful starting estimate but not exact, especially with irregular cycles. An early ultrasound scan gives more accurate dating. Treat the calculated date as a guide, and let your care team confirm it.
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