Estimate your due date and how many weeks pregnant you are from your last period, conception date or IVF transfer date. For information only.
Pregnancy weeks are counted from the first day of the last period, about two weeks before conception.
Only about 1 in 20 babies arrive on the due date; most come within two weeks either side. An early ultrasound gives a more accurate date.
Count the weeks from the first day of your last period. Enter that date and the calculator shows your weeks and days today.
Yes. Your doctor or midwife may adjust it after a dating ultrasound, usually done between 8 and 14 weeks.
The second trimester starts at 14 weeks and the third at 28 weeks.