Pregnancy due-date calculator
The OB wheel: due date and gestational age from your last period, a known due date, an ultrasound, conception or IVF — plus a reverse “when will I be X weeks?” look-up.
Open →Pregnancy tools & calculators
A small set of free, private pregnancy tools. Every one runs entirely in your browser — no accounts, no tracking, and nothing you enter ever leaves your device.
Due date calculator (last period)
A simple due-date estimate from your last period and cycle length — the quickest way to a date if that’s all you have.
Open →Gestational age calculator
How far along you are in weeks and days, from your last period or a known due date — with trimester and pregnancy week.
Open →CRL calculator
Convert a crown-rump length measurement in millimetres to gestational age and an estimated due date. Uses the Robinson–Fleming formula.
Open →IVF due date calculator
Estimate your due date from a day-3 or day-5 embryo transfer or egg retrieval — the most precise dating there is.
Open →Conception date calculator
Due date from a conception or ovulation date, or work backwards to an estimated conception date. Also handles IUI.
Open →Gravida & para calculator
Decode obstetric shorthand like G3P2002 — gravida, para and TPAL (term, preterm, losses, living) explained.
Open →Weeks to months converter
Convert pregnancy weeks to months and back, with a full chart. See how many months 16, 28 or 40 weeks is.
Open →Trimester calculator
See the exact dates of your first, second and third trimesters — and which one you’re in today.
Open →Ovulation & fertile-window calculator
Find your most fertile days and estimated ovulation from your cycle, then jump straight to a due date if you conceive.
Open →hCG doubling-time calculator
Enter two beta-hCG results to see the doubling time and daily rise in early pregnancy. Educational — interpret with your clinician.
Open →Contraction timer
Time how long contractions last and how far apart they are, with a 5-1-1 pattern note. For late pregnancy and early labour.
Open →Baby predictions (just for fun)
The Chinese gender chart, your baby’s star sign, Chinese zodiac animal, birthstone and birth flower. Entertainment, not science.
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