Pregnancy Due Date Calculator
Estimate your due date from last menstrual period, conception date, ultrasound, or IVF transfer.
Typical 21–45; default 28
Result
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Choose a method, enter dates, then click Calculate.
Standard gestation is 280 days from LMP (40 weeks) or 266 days from conception. Ultrasound back-calculates LMP from gestational age at the scan. IVF uses transfer date + 266 − embryo day (3/5/6).
LMP is most common; use ultrasound or IVF when you have scan or transfer data.
Adjust cycle length for non-28-day cycles on LMP mode.
See gestational age today, countdown, and milestone dates.
28-day cycle, Naegele’s rule.
Estimated due date ≈ October 22, 2026.
Treating EDD as exact
Fix: Expect a ±2 week window and follow provider guidance.
Counting from conception as gestational age
Fix: Clinical weeks usually start from LMP (~2 weeks before conception).
Estimate your due date from last menstrual period, conception date, ultrasound, or IVF transfer.
Typical 21–45; default 28
Result
—
Choose a method, enter dates, then click Calculate.