Due Date Calculator
Estimate a pregnancy due date from last period, ultrasound dating, conception date, or IVF embryo transfer.
Estimate due date
Estimated due date
247 days from today · gest. 4w 5d
Implied LMP
Mon, Jun 15, 2026
Implied conception
Mon, Jun 29, 2026
About 40 weeks from LMP is the usual reference. Most births fall somewhere in the 37–42 week band; landing on the exact day is uncommon. Preterm range if birth now.
Estimate only — not medical advice
These dates are calendar estimates from average cycle and pregnancy lengths. They are not a diagnosis, not contraception, and not a substitute for clinical care. Talk with a qualified clinician about your situation.
How it works
Due dates are estimates—commonly 280 days from the first day of the last menstrual period, or 266 days from conception.
Ultrasound and IVF transfer dating can refine the estimate when those dates are known.
Frequently asked questions
- Will my baby arrive on the due date?
- Usually not. Most births fall within a multi-week window around the estimate. The date is a clinical reference, not a guarantee.
Related calculators
- Pregnancy CalculatorTrack gestational age, trimester, and milestone dates from LMP, due date, ultrasound, conception, or IVF.
- Ovulation CalculatorProject ovulation days and fertile windows for upcoming cycles from your last period and cycle length.
- Period CalculatorForecast upcoming period and ovulation dates using your last period start, cycle length, and bleeding days.
- Conception CalculatorHighlight peak fertile days across cycles and show the estimated due date if conception happens that month.