Calculate your due date, track your pregnancy calendar in weeks of amenorrhea and gestation. Download all the key dates of your pregnancy free of charge.

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My pregnancy calendar

Estimated date of pregnancy


Presumed date of delivery


Size : Weight : Height of a

My pregnancy calendar week by week

T Month Week of pregnancy and amenorrhea week Reviews
1st quarter
1 1 SG - 3 SA
2 SG - 4 SA
3 SG - 5 SA
4 SG - 6 SA
2 5 SG - 7 SA 1st prenatal examination before the end of the 3rd month
6 SG - 8 SA
7 SG - 9 SA
8 SG - 10 SA
3 9 SG - 11 SA 1st ultrasound (dating) and trisomy screening
10 SG - 12 SA 1st ultrasound (dating) and trisomy screening
11 SG - 13 SA 1st ultrasound (dating) and trisomy screening
12 SG - 14 SA
13 SG - 15 SA
2nd quarter
4 14 SG - 16 SA 2nd prenatal consultation
15 SG - 17 SA
16 SG - 18 SA
17 SG - 19 SA
5 18 SG - 20 SA 3rd prenatal consultation
19 SG - 21 SA
20 SG - 22 SA 2nd ultrasound (morphological)
21 SG - 23 SA 2nd ultrasound (morphological)
22 SG - 24 SA 2nd ultrasound (morphological) and screening for gestational diabetes
6 23 SG - 25 SA 4th prenatal consultation and screening for gestational diabetes
24 SG - 26 SA Screening for gestational diabetes
25 SG - 27 SA Screening for gestational diabetes
26 SG - 28 SA Screening for gestational diabetes
3rd quarter
7 27 SG - 28 SA 5th prenatal consultation and the end of extreme prematurity
28 SG - 30 SA Start of birth preparation sessions
29 SG - 31 SA
30 SG - 32 SA 3rd ultrasound and the end of extreme prematurity
8 31 SG - 33 SA 6th prenatal consultation - 3rd ultrasound scan
32 SG - 34 SA 3rd ultrasound scan
33 SG - 35 SA
34 SG - 36 SA End of medium prematurity
9 35 SG - 37 SA
36 SG - 38 SA 7th prenatal consultation
37 SG - 39 SA
38 SG - 40 SA
39 SG - 41 SA

Week after week post-delivery


Your maternity leave

Leave Date Duration
Start of any medical leave 2 weeks
Start of prenatal leave
End of post-natal leave
(excluding any medical leave)

Pregnancy calendar by Élia

You've been waiting for it for years, months or weeks. It may come as a surprise to you, but the test is positive: you're pregnant ! For many people, pregnancy is a time of great questioning, a time of physical, psychological and emotional upheaval. Here's a pregnancy calendar to help you see things a little more clearly over the next nine months.

Reducible content

How to use the Élia pregnancy calendar

Elia' s easy-to-use pregnancy calendar lets you print out and view the weeks of your pregnancy, trimesters and key dates at a glance, as well as your due date, ultrasounds and postpartum preparations. Week by week, follow the progress of your future child.

To do so, please indicate the date of your last periodsthe average length of your menstrual cyclethe number ofchildren you have or have not had. Our pregnancy calendar will give you an exact idea of the key dates in your pregnancy.

What are the most important dates in pregnancy?

Pregnancy generally lasts 9 months for most women, 41 weeks of amenorrhea. Three intense trimesters with their share of surprises, transformations and expectations. Between the changes in your body and the evolution of your fetus, certain dates are important to know to ensure your baby's healthy development, and medical care adapted to your needs and state of health.

Write them down now or download them from your pregnancy calendar so you'll always have them with you! 

  • The date of your last periods, the date of conception or the date of transfer or insemination for those undergoing MAP;
  • Expected delivery date ;
  • LYour gynecologist will perform the 1st trimester ultrasound, the 2nd trimester ultrasound and the 3rd trimester ultrasound;
  • Administrative: declaring your pregnancy, lregistering at the maternity ward, appointments with your midwife, calculating your maternity leave.

How to calculate your pregnancy calendar?

When your gynecologist talks to you about your pregnancy, he or she will probably talk about trimesters, weeks of amenorrhea and weeks of pregnancy. This is the difference betweenfetal age andgestational age.

Weeks of pregnancy

We speak in weeks of pregnancy when we talk about the real age of the future baby. In fact, from the date of conception to today's date. The date of conception is defined at the time of the first ultrasound scan or earlier, when the woman knows her ovulation date and the date on which she and her partner had intercourse. The pregnancy table is also easier to calculate if the mother-to-be has undergone MAP.

Weeks of amenorrhea

Gestational age is calculated in weeks of amenorrhea. Pregnancy is calculated from the date of the last periods until birth, between 38 and 42 weeks. In general, the start of pregnancy and the age of your fetus will be calculated two weeks after the start of your last menstrual period.

Calculate on the basis of the first day of periods

Calculating your pregnancy according to the first day of your periods will be reliable as long as you have a regular 28-day cycle. In fact, ovulation and the start of your last periods will be considered as the first two weeks of pregnancy. This method is therefore not 100% reliable.

To calculate her due date with the first day of the last periods, you need to add 280 days. This will give you a good estimate of your CCA.

Naegele rule

This rule is one of the most widely used for calculating your due date. To calculate your pregnancy calendar, we take into account the date of the 1st day of your last periods, the length of your cycle (between 20 and 45 days) and we add 280! On average, a cycle lasts 28 days, with ovulation occurring 14 days after the start of the cycle. If your cycle is shorter, your due date will be estimated earlier; if your cycle is longer, D-day will be later. 

Mittendorf and William's rule

The Mittendorf and William rule is more exhaustive than the Naegele rule. We luse it to create our pregnancy calendar algorithm and application. In fact, we'll be collecting more information, so the results will be more accurate. A study shows that mothers-to-be who are expecting their first child (primigravida) have a longer pregnancy. On average 288 days, compared with 283 days for those who have already had a first child (multiparous).

Our calendar will therefore be calculated by adding days of gestation to the Naegele rule.

  • For primigravida: 1st day of last periods - 3 months + 15 days. An additional 8 days;
  • For multiparas: 1st day of the last periods - 3 months + 10 days and 3 days more;
  • This adds 8 days for primigravida and 3 days for multipara, compared with the Naegele rule.

Parikh's rule

If you have an irregular cycle, as in the case of women with polycystic ovary syndrome (PCOS), for example, the Parikh formula will be used. Indeed, the Naegele formula could give an erroneous result. The formula is: day of last periods + 9 months - 21 days + length of previous cycles.

Wood's rule

This formula takes into account the length of your usual menstrual cycles and the number of pregnancies you've already had and brought to term.

To begin, calculate your due date (DPA):

  • For primigravida: 1st day of the last periods + 1 year - 2 months and two weeks;
  • For multiparas: 1st day of last periods + year - 2 months and 2.5 weeks.

Then use the due date you obtained and adapt it to the length of your cycle:

  • For women with a cycle of more than 28 days DPA + (actual cycle length - 28 days) = DPA ;
  • For those with 28-day cycles: WFA - (28 days - actual cycle length) = WFA.

Calculate from date of conception

Even if you know the date of your last sexual encounter, the date of conception is rarely known, as spermatozoa have a maximum lifespan of 5 days, and a woman's body ovulates 24 hours after being released from the ovary.

Calculating with ultrasound

Gynecologists or midwives will perform a dating ultrasound to get an accurate estimate of the baby's age based on its development. In general, a dating ultrasound is performed between the 11th and 13th week of amenorrhea, in the absence of periods.

Calculate with transfer or insemination date - PMA

If you're undergoing ART treatment, particularly IVF, the date of conception is very easy to calculate, as it corresponds to the time of embryo transfer. This corresponds to the age of the embryo or the date of ovulation.

Pregnancy calendar FAQ

How do I calculate my pregnancy calendar?

Fill in the date of your last periods, the length of your menstrual cycle and the number of children you already have to calculate your pregnancy calendar and find out your due date.

Which week corresponds to which month of pregnancy?

Your pregnancy lasts an average of 41 weeks. Identify the months and trimesters of your pregnancy with our pregnancy calendar.

What is the most difficult week of pregnancy?

Pregnancy lasts nine months. In general, the first trimester is considered the most difficult. Between nausea, fatigue and fear of miscarriage, the 11th week of pregnancy is often the most critical.

When is my maternity leave?

Maternity leave starts 6 weeks before childbirth, i.e. prenatal leave. After the birth, you have 10 weeks' postnatal leave. These figures apply to maternity leave for the 1st and 2nd child. From the third child onwards, the durations are extended. Calculate the start and end dates of your maternity leave quickly with our pregnancy calendar!