What the tool does, how to run it, and what to expect from the result.
Pregnancy is counted from the first day of your last period, not from conception, so at conception you are already about two weeks pregnant. Enter that date (or a conception or IVF transfer date) to see how far along you are today in weeks and days, which trimester you are in, and the due date 40 weeks after the last period. An early ultrasound dating from your doctor or midwife takes priority over this estimate.
A quick way to understand who this helps, what it solves, and where it connects next.
Expecting parents who want to know how far along they are.
Using the pregnancy weeks calculator without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
From the first day of the last menstrual period. Weeks 1-13 are the first trimester, 14-27 the second and 28 to birth the third. A full-term pregnancy is about 40 weeks, or 280 days, from that date.
Cycles longer or shorter than 28 days shift ovulation, and a first-trimester ultrasound measures the baby directly. When the two differ by more than about a week, clinicians usually go by the scan.
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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.