Pregnancy Due Date Calculator


Our pregnancy due date calculator provides a useful way for expecting mamas to know what their due date is as well as what to expect at the different stages of pregnancy. Just enter the first date of your last period and you will receive helpful information to benefit you at every stage if your pregnancy. Receive details including your baby’s due date, first fetal heart tones rate, the best time to evaluate cervical length in a patient with risk factors, the best time for a routine anatomy ultrasound, and how many days old your little one is.



Enter the date of the first day of your last menstrual period (LMP):



Probable date of conception:


Foetal Age Today:


Best date range for NT scan:


(12 weeks 3 days to 13 weeks 3 days)

Morphology Scan Date:


(19 weeks)

First Heart Tones by Doppler:


(11 to 12 weeks)

Best time to evaluate cervical length in patient with risk factors:


Best time for routine anatomy ultrasound:


(18 to 20 weeks)

Estimated Due Date:



When Is My Due Date?

Your due date is 38-40 weeks from conception. An easy way you can estimate your due date is to count 40 weeks from the first day of your last menstrual period. Another method you can use is to subtract three months from the first day of your last period, then add seven days. It’s just as normal to deliver a week or two before or after your estimation. Estimating from your last period can be tricky for women with irregular periods. If you can remember your conception date, you can also use this to work out your due date. Just add 266 days to your conception date and you will have your estimated due date.

What Can I Expect During Each Trimester Of My Pregnancy?

First Trimester

woman stretching

Your first trimester is week 1-13 of your pregnancy. If you are not certain which week of your pregnancy you are in, use our pregnancy calculator above. During your first trimester, your baby starts as just a small collection of cells. Implantation in your uterine wall occurs around week 4. Your little one will grow from a size smaller than a poppy seed to the size of a peach. You may not look pregnant yet but you will be feeling it!

Your pregnancy hormones will be ramping up as your body prepares to carry your baby for the next nine months. In the first trimester, your baby is growing limbs and developing body systems. Their organs begin to take shape and your baby will start to move! Development highlights include bones growth, hair and nails, digestive system development, eyesight, development of the heart, and formation of the vocal cords. Your baby also starts to develop white blood cells to fight off germs.

Common early pregnancy symptoms include aches and pains, fatigue, gas, and morning sickness. Morning sickness happens for many women at multiple times throughout the day and usually shows up around week 6 of your pregnancy. At week 6 you will also have a noticeable difference in your breast size and tenderness.

Second Trimester

Your second trimester is week  14-27. The second trimester of your pregnancy you will typically experience relief from the negative early pregnancy symptoms. A lot starts changing in this trimester for both mama and baby. You’ll start to feel less nauseous and more foods will start to smell and taste good again. The second trimester is one many women agree is the best trimester of their pregnancies. Your breasts will still be large but a lot of the tenderness will have subsided. By the end of your second trimester, your pregnant belly will start to show.

By week 18 your baby is the size of a sweet potato. They are now able to yawn and hiccup! By week 12 you should be able to feel your little one move and kick. At week 23 your baby will start growing rapidly. They typically double in size in the next four weeks. By the end of your second trimester, your baby will way around 2 pounds and have many more growth developments.

Hair and nails growing, and your baby is flexing their digestive system and preparing for life outside the womb by practicing sucking and swallowing. They are starting to be able to taste foods you eat through your amniotic fluid which is why a healthy diet is so important. Your little one’s senses are developing and their eyes and ears have moved into the correct position. They are able to hear, see, and smell by week 22. The heart has a more regular beat by week 17 and by week 25 capillaries form and can carry oxygenated blood through your baby’s body. The baby’s brain has developed to induce kicking and a regular heartbeat, and will now start blinking their eyelids.

Third Trimester

Your third trimester begins week 28 and goes until about week 40 of your pregnancy. You may go into labor a couple of weeks earlier or later. In the third trimester, your baby goes from weighing 2 pounds to growing 6-9 pounds. This can lead to some pretty serious kicks from your baby. They are developing cartilage to bone in the next couple of months so make sure you are eating calcium-rich foods. Your baby’s five senses are fully developed between week 29-30. and they will be able to hear your voice, perceive light and dark, and taste what you eat. Your little one’s brain is growing rapidly and they will be blinking, dreaming, and regulating their own body temperature. At around 34 weeks your baby’s body will turn and position with the head pointing down for delivery.

You will experience abdominal aching, fatigue, backaches, and swelling in your ankles, but you are on the home stretch!

Use our handy pregnancy calculator to calculate your due date so you can start planning for your pregnancy in the coming months. Check out our research articles for more information on having a healthy, fit pregnancy to benefit you and your baby.

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