What the tool does, how to run it, and what to expect from the result.
The standard estimate (Naegele's rule) adds 280 days to the first day of the last menstrual period, based on a 40-week pregnancy counted from that date. Conception-date and IVF-transfer methods use the same underlying 266 days from conception, adjusted for how many days old the embryo was at transfer. Only a small share of babies arrive on the exact estimated date; a normal full-term birth spans roughly 3 weeks before to 2 weeks after it.
A quick way to understand who this helps, what it solves, and where it connects next.
Anyone estimating a pregnancy due date and current gestational week.
Getting a standard due-date estimate before or alongside a doctor or midwife visit.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is completely free, with no sign-up and no usage limits.
No. It applies a standard dating formula used across obstetrics, but an ultrasound-based estimate from your doctor or midwife is more accurate and should take priority over any online calculator.
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Estimate a pregnancy due date from your last period, conception date, or IVF transfer date, using standard obstetric dating conventions.
May 13, 2027Estimated due date
8 weeks, 0 daysToday, trimester 1
This is an estimate using standard dating rules (last period + 280 days). Only about 1 in 20 babies arrive on the exact due date; a full-term birth anywhere from 3 weeks before to 2 weeks after is normal. This is not medical advice, an ultrasound-based estimate from your doctor or midwife is more accurate.