Pregnancy Due Date Calculator


Use the Pregnancy Due Date Calculator to estimate* your due date and find out how far along you are. Would you like to know how many days pregnant you are? Are you curious when your baby was conceived and what is your due date? Our Pregnancy Due Date Calculator helps you to find out. You only have to enter the first day of your last period and the length of your cycle (the default value is the most frequent value, 28 days). Based on this date the calculator tells you how long you have been pregnant when the baby was conceived and it also provides an estimation for your due date.

Pregnancy Due Date Calculator


Learn how to use the Pregnancy Calculator

1. How do I use the Pregnancy Due Date Calculator?

First, enter the date of the first day of your last menstrual cycle, followed by the average length of your menstrual cycle (eg, 28). The pregnancy calculator then calculates the estimated date of your pregnancy, also how long you are pregnant, and finally the expected date of delivery.

2. How does the Pregnancy Due Date Calculator works?

With the information provided, we expect an average of 40 weeks or 280 days to become pregnant, which is medically accepted and practically used. It is important that if you have a different menstrual cycle, be sure to change the default value (28) to what is specific to you.

*The dates and values provided below are only approximate values. Real dates may differ. We do not take any responsibility for the correctness of the calculated data. Please also read or Term of Use before using our calculators.

3. What is a Pregnancy Trimester?

Trimester represents an important stage of pregnancy. The first trimester is from week one through 12 and includes conception. During the first trimester, the baby begins to develop, but even at the end of the trimester, it may not have any serious signs. During this period, it is possible that the mother is already suffering from nausea. In the second trimester (4-6 months or 13-28 weeks), mom’s strength returns. During this period, mothers are more desirable. The last 3 trimesters (7-9 months or 29-40 weeks) are the most difficult of all. During this period, energy decreases and fatigue are very common. During this period, mothers must avoid stress and physical exertion.

Pregnancy Timeline

DAYS 1–14The countdown of your pregnancy begins with your period—the start of the fertility cycle.No baby yet.
2 WEEKSA mature egg is released from the ovaries and if a sperm fertilizes it, a baby is conceived.length: approximately 1⁄250 in (0.1 mm)
3 WEEKSAmazing things are happening inside your body, and some women may experience early signs.length: > 1⁄32 in (1 mm)
4 WEEKSIf you miss a period this week, it could be the first time you wonder, “Am I pregnant?”length: 1⁄16 in (2 mm)
5 WEEKSYou won’t be looking pregnant but as your body adapts to the pregnancy, you might well be feeling it.1⁄8 in (4 mm)
6 WEEKSAlthough there is no visible belly bump, it doesn’t mean your body isn’t changing in other ways.3⁄8 in (8 mm)
7 WEEKSThough you still cannot feel the baby inside you, the heart can be seen beating on an ultrasound now.1⁄8 in (1.6 cm), 1⁄32 oz (1 g)
8 WEEKSAs your body adapts to the hormonal changes of pregnancy, you may get sudden mood swings.7⁄8 in (2.3 cm), 1⁄16 oz (2 g)
9 WEEKSYour tiny baby is starting to move around, though you won’t yet be able to feel this exciting action.11⁄4 in (3 cm), 1⁄8 oz (4 g)
10 WEEKSThough not obvious to others, you may start to notice that your body is beginning to look pregnant.15⁄8 in (4.1 cm), 1⁄4 oz (7 g)
11 WEEKSYou may see your baby for the first time on your first ultrasound. It’s the start of your love affair!21⁄8 in (5.4 cm), 1⁄2 oz (14 g)
12 WEEKSWith nausea and fatigue fading away, you are likely to feel more invigorated.27⁄8 in (7.4 cm), 3⁄4 oz (23 g)
13 WEEKSChanges inside your body mean that you are glowing now. Sit back and enjoy this settled period.33⁄8 in (8.7 cm), 11⁄2 oz (43 g)
14 WEEKSYour pregnancy may be becoming obvious, and you may feel an incredible sense of well-being.4 in (10.1 cm), 21⁄2 oz (70 g)
15 WEEKSIt is normal to have mixed feelings about your changing body shape and curves.45⁄8 in (11.6 cm), 31⁄2 oz (100 g)
16 WEEKSYou will definitely start to look pregnant now, even if you don’t feel that different.51⁄8 in (13 cm), 5 oz (140 g)
17 WEEKSThe bloom of pregnancy may be showing in your skin, and even in your mood.55⁄8 in (14.2 cm), 63⁄4 oz (190 g)
18 WEEKSYou may experience your baby’s early, fluttering movements. These are known as “quickening.”6 in (15.3 cm), 81⁄2 oz (240 g)
19 WEEKSYou are almost halfway through your journey. Congratulations!61⁄2 in (16.4 cm), 101⁄2 oz (300 g)
20 WEEKSYour ultrasound gives you a glimpse of your well-formed baby.101⁄2 in (26.7 cm), 121⁄4 oz (360 g)
21 WEEKSYou are becoming more aware of your lively baby.107⁄8 in (27.8 cm), 15 oz (430 g)
22 WEEKSYou may see some unwanted, though usually temporary, side effects.113⁄8 in (28.9 cm), 1.1 lb (501 g)
23 WEEKSKeeping active means you will be well prepared for the birth, and primed for a rapid recovery.12 in (30 cm), 1 lb 5 oz (600 g)
24 WEEKSYour baby might be active when you want to sleep— kicking, yawning, and even hiccupping.135⁄8 in (34.6 cm), 1 lb 8 oz (660 g
25 WEEKSAt the close of the second trimester, your thoughts might turn to the birth.14 in (35.6 cm), 1 lb 101⁄4 oz (760 g)
26 WEEKSIt’s the home stretch. Your belly is a source of pride, and you will marvel as it grows.143⁄8 in (36.6 cm), 1lb 141⁄2 oz (875 g)
27 WEEKSReassuringly, babies who are born at this stage in pregnancy have a 90-percent survival rate.146⁄8 in (37.6 cm), 2 lb 4 oz (1 kg)
28 WEEKSAt this point, you may not remember how you felt without a belly.151⁄8 in (38.6 cm), 2 lb 8 oz (1.2 g)
29 WEEKSYou may start to feel sharp kicks from your baby.155⁄8 in (39.9 cm), 3 lb (1.3 kg)
30 WEEKSReview your birth plan around now. It’s not too late to make changes.161⁄8 in (41.1 cm), 3 lb 3 oz (1.5 kg)
31 WEEKSYour baby may be lying in any number of positions.165⁄8 in (42.4 cm), 3 lb 10 oz (1.7 kg)
32 WEEKSNow is a good time to start thinking about practical preparations.171⁄8 in (43.7 cm), 4 lb 31⁄2 oz (1.9 kg)
33 WEEKSEach day, your baby is preparing for survival in the outside world.176⁄8 in (45 cm), 4 lb 111⁄2 oz (2.1 kg)
34 WEEKSPracticing relaxation techniques will help you prepare for labor.181⁄8 in (46.2 cm), 5 lb 5 oz (2.4 kg)
35 WEEKSYour body is well and truly gearing up for the big day.185⁄8 in (47.4 cm), 5 lb 10 oz (2.6 kg)
36 WEEKSMake sure you have a plan ready for when you go into labor.191⁄8 in (48.6 cm) 6 lb 5 oz (2.9 kg)
37 WEEKSAt this point you are probably as big as you are going to get.195⁄8 in (49.8 cm), 6 lb 10 oz (3.1 kg)
38 WEEKSDoublecheck your birth plan; it’s not too late to make changes.20 in (50.7 cm), 7 lb 3 oz (3.3 kg)
39 WEEKSMake sure you are clear on how to recognize the signs of labor.201⁄8 in (51.2 cm), 7 lb 11 oz (3.5 kg)
40 WEEKSVery soon you will be holding your new baby in your arms201⁄6 in (51.2 cm), 7 lb 11 oz (3.5 kg)

source: The Pregnancy Encyclopedia

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