Pregnancy & due date
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Pregnancy calendar math only — not medical advice: estimated due date from last menstrual period, gestational week and day, countdown to due date, trimester from weeks, conception date estimates, and IVF transfer due dates. Ultrasound dating may revise your due date; confirm with your clinician.
5 tools in this section
Due Date
Estimate pregnancy due date from the first day of your last period and average cycle length using the 280-day rule. Calendar math only — not medical advice.
Pregnancy Week
Find how many weeks and days pregnant you are — and which trimester — from your last period or a known due date. Calendar estimate — not medical advice.
Pregnancy Countdown
Count days remaining until your due date from a reference date. Clinicians may revise the date after ultrasound. Calendar estimate — not medical advice.
Conception Date Estimate
Estimate a rough conception date from your last menstrual period or due date using standard calendar assumptions. Not a fertility predictor or medical advice.
IVF Due Date
Estimate IVF due date from embryo transfer date and embryo age at transfer (day 3, 5, or 6). Calendar formula many clinics use — confirm with your care team.