Pregnancy due date calculator

Get your estimated due date (Naegele's rule), your current gestational age, trimester, and your baby's Chinese + Western zodiac — then feed the date straight into the gender predictor for the fun half.

Naegele's ruleDue date = first day of last period + 280 days (40 weeks).
From conception?Conception + 266 days lands on the same date.
Zodiac readyBabies due near Chinese New Year can belong to either zodiac year.

How accurate is a due date?

Only about 4–5% of babies arrive exactly on their due date — the majority arrive within a two-week window either side. First-time moms average ~40 weeks + 4 days. Early ultrasound (8–13 weeks) refines dating more accurately than any calendar rule, so treat this as a planning anchor, not a countdown calendar.

Why conception + 266 days?

Gestational age is counted from the last period (280 days), which includes roughly two weeks before ovulation. Actual fertilization-to-birth is ~266 days. Our calculator keeps both conventions straight — no off-by-two-weeks folklore math. Then head to the gender predictor to see what the chart would guess.

Altri strumenti

Calcolatore Two dates → one instant boy/girl guess with real lunar conversion. Tabella The full interactive lunar age × month grid — tap any cell. Pianificatore Favourable months to conceive a boy or a girl, with date windows. Età lunare Find your traditional virtual (lunar) age in seconds. Maya The Mayan odd/even method as a playful second opinion. Quiz 12 old wives’ tale clues and a folkloric verdict.