Your result will appear here.
Baby's age from conception
Due date
↑ last periodbirth ↑
Gestational age from your last period, as doctors count it
Until birth
Key dates
- Conception (approximate)
- 2nd trimester
- Halfway
- 100 days to go
- 3rd trimester
- Due date
- Zodiac sign on the due date
How it's calculated
On average, pregnancy lasts 266 days from conception, which is 280 days from the first day of the last period with a 28-day cycle. Ovulation happens roughly 14 days before the next period — with a longer or shorter cycle, conception and the due date move by the difference.
The baby's age is counted from conception, while gestational age — as doctors count it — starts from the last period, so it is about two weeks more. Months are four-week periods.
The result is an estimate and does not replace your doctor or an ultrasound scan.