Estimate your baby's arrival and track your journey week by week
* Cycle length ranges from 22 to 44 days. 28 days is the average for most women. This is not a medical diagnosis — all calculations are estimates based on averages.
This calculator provides estimates only and is not a substitute for professional medical advice. Please consult your healthcare provider for accurate information.
Estimate your baby’s arrival and track your journey week by week
Find your estimated due date and see exactly how many weeks pregnant you are, then book the right scan for your stage.
The most common method. Enter the first day of your last period and your cycle length.
If you tracked ovulation, the tool counts forward 38 weeks from conception.
A first-trimester dating scan is the most accurate way to estimate your due date.
Calculated from the transfer date, adjusted for 3-day or 5-day embryo transfer.
Already have a date from your doctor? See your current week and key milestones.
Pregnancy is measured in weeks from the first day of your last period and is split into three trimesters. Full term is considered 39 to 40 weeks, and babies arriving from 37 weeks are still considered term.
| Trimester | Weeks | What is happening |
|---|---|---|
| First | 1 – 13 | Major organs form. First scan and booking visit. |
| Second | 14 – 27 | The anomaly scan is usually done around weeks 18 to 22. |
| Third | 28 – 40 | Baby gains weight. Delivery planning begins. |
Knowing your week is only useful if it tells you what to do next. Here is the simple version, with the right service to book at each stage.
Dating scan, first antenatal visit, and NT scan around weeks 11–13.
A due date calculator gives a reliable estimate, but it is not exact. Only around 1 in 20 babies are born on their due date. A first-trimester dating scan gives the most accurate estimate, and your doctor may revise the date after it.
Pregnancy is counted from the first day of your last menstrual period, not from conception. This is why you are considered about two weeks pregnant at the point of conception.
Use the ultrasound method. A dating scan in the first trimester estimates your due date without needing your last period date. The calculator can work from the scan date and the weeks measured.
For IVF, the due date is based on the embryo transfer date. The calculation differs for a 3-day (cleavage) transfer and a 5-day (blastocyst) transfer, and the tool adjusts for both.
Count from the first day of your last period to today. The calculator does this for you and also shows your trimester and estimated due date.
Yes. An early dating scan often gives a more accurate date than the last period, so your doctor may adjust it. Later in pregnancy, the date is rarely changed.
The anomaly scan is usually carried out between 18 and 22 weeks to check your baby’s growth and development. You can book yours at Anandi Hospitals.