Find out your due date with our calculator

Just found out you're pregnant? Work out when your baby's due with our due date calculator.

📅 Calculate your due date

Tommy’s funds pregnancy research that saves babies’ lives and we’d love to keep you posted with our research news, campaign activities, fundraising events and appeals. Your details will only be used by Tommy’s – we will never give your information to other organisations to use for their own purposes. Read our full data protection and privacy policy for further information. You are free to change your mind at any time.

If your cycle is shorter or longer than 28 days, please adjust the number above.

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How to use the pregnancy calculator

To find your due date you just need to select the date of the first day of your last period on our pregnancy calculator tool and click 'submit.'

You will then receive your estimated due date and the option to sign-up to our pregnancy email. Our weekly email gives you fun pregnancy facts, useful tips and great recipe ideas to help you and your baby have the healthiest possible pregnancy.

How accurate is the due date?

The pregnancy calculator gives you an approximate due date, which it works out your due date by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle, it is adjusted for longer or shorter cycles). Your period and ovulation are counted as the first two weeks of pregnancy. If you have the baby on your due date, your baby has been growing for 38 weeks, not 40, but you are still classed as 40 weeks pregnant. 

Will I get a more accurate due date later in the pregnancy?

You will have your first appointment with the midwife, the 'booking appointment', between 8 weeks and 12 weeks pregnant. Here you will be given a scan and receive an accurate date for your baby's birth. But if you're impatient to know when your baby will arrive, then our calculator tool gives you an estimate due date without the wait.

Not pregnant yet? We have an ovulation calculator that might be helpful.

Read more

Pregnancy in the news

Last reviewed on April 1st, 2014. Next review date April 1st, 2017.

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Comments

  • By Agbo Dester (not verified) on 3 Jun 2018 - 19:25

    I am 35 weeks pregnant and I have been having abdominal contractions since yesterday night. It contracts so frequently that makes me uncomfortable and somehow painful, could it be premature labor that I am going into. Please I need your help

  • By Midwife @Tommys on 4 Jun 2018 - 16:49

    Braxton hicks contractions are common at 35 weeks. We like to call them practice contractions because the uterus goes hard for a short time and then relaxes. Usually this is not associated with pain. If you think that you may be in labour, please call your maternity unit who will ask you some questions and assess over the telephone if you need to be seen. Best wishes to you

  • By Rich (not verified) on 29 May 2018 - 09:01

    Hey, I am now 23 weeks pregnant. But I can't show my baby bump yet. Am I normal ?

  • By Midwife @Tommys on 30 May 2018 - 16:03

    Hi Rich
    Bumps come in all shapes and sizes. As long as your midwife is not concerned about the measurement of your bump (she/he should measure your bump from 16 weeks onwards) then there is no concern. If there is a concern over fetal growth, you will be referred for an urgent growth scan.
    Take care
    Sophie,Tommy's Midwife

  • By Bee (not verified) on 18 May 2018 - 12:32

    Hi i have been having lower abdominal pains, i'm 11 weeks plus.
    what could this be?

  • By Midwife @Tommys on 18 May 2018 - 16:31

    Hi Bee,
    Sometimes lower abdominal pain can be normal in pregnancy as it is common to get some cramps and stretching type pains however if this is on going, and particularly if you are having any bleeding or any other symptoms then do contact your GP for review.
    Best wishes,
    Tommy's midwives

  • By Nelly (not verified) on 4 Feb 2018 - 18:24

    I tested positive but i see blood each time I went to urinate it have lasted for some days now am I really pregnant

  • By Midwife @Tommys on 5 Feb 2018 - 15:26

    Hi, I hope you are OK. Sometimes a miscarriage can happen really early and can appear like a normal period. Try doing another test in a week to see if you are still pregnant. If you have abnormal bleeding or pain please see your doctor for advice.

  • By Kat (not verified) on 18 Jan 2018 - 01:11

    My last period was 10th December not had one since but pregnancy test negative

  • By Midwife @Tommys on 19 Jan 2018 - 13:01

    Hi Kat,
    Testing for pregnancy can be different for everyone, and for some pregnancy is detected a little but later especially if you have a longer cycle. It maybe worth testing in about a week, if this is still negative and your period does not come then see your GP who may do a blood test which is more sensitive. If you are not already, then we would strongly advise for you to be taking a folic acid supplement. Take care x

  • By Anonymous (not verified) on 13 Dec 2017 - 21:59

    Hello,
    I’ve just found out I am pregnant ( yay )
    But I’m struggling to work out my due date.
    The test said ‘1-2 weeks ‘
    My cycle is inconsistant and not a typical 28 day.

    My last period was 5th-9th Nov. I kept track of my ovulation day which was the 28th nov.
    I have read that the GP would normally go by the date of your last period however as I know my ovulation day and it would time perfect with the pregnancy test 1-2 weeks, should I just go by this instead ?

    Thank you

  • By Midwife @Tommys on 14 Dec 2017 - 09:42

    Using your last menstrual period (LMP)date of 5th Nov, you are approx 5 weeks pregnant. However, if your cycle length is inconsistent then it is likely to be less than that. It would be sensible to make a GP appointment as they would go by your LMP date and then this may change when you have your first Ultrasound scan. It doesn't matter too much if there is a discrepancy in dates- the midwives and obstetric doctors will always go by the scan measurements and dating to give an accurate gestation and due date.
    Congratulations and please take care of yourself!
    Sophie,Tommy's Midwife

  • By Anonymous (not verified) on 2 Dec 2017 - 00:28

    I am waiting for 2 months for my periods. All my blood tests and urine tests were negative. Started getting faint positives since last two days in morning urine / concentrated urine (in bladder for atleast 4 hours) and negative when urine is diluted. Doc did urine test today when it was diluted and told me it is negative. Sent to an ultrasound before 2 days and it showed nothing. But I am getting faint positives only since two days and I’m using same brand which gave me negative results earlier. Why ultrasound didn’t detect my pregnancy? Am I too early to go for ultra? Why my urine test would fail when I get faint positives in morning urines / concentrated urines?

  • By Midwife @Tommys on 4 Dec 2017 - 12:04

    Hi, It is possible though very rare to get false positive pregnancy tests. This can happen if you have blood or protein in your urine or if you are on certain medications. Usually a blood test will confirm a pregnancy before a a urine test but it does have to be sent to the lab for analysis and this takes time. Best advice is to wait a week and repeat the test. If you are still getting positive tests or have any tummy pain you should see your doctor again.

  • By Krit (not verified) on 30 Nov 2017 - 23:22

    Hi
    I haven’t got my period since 65 days. Though I have pcod I have been regular on my date for atleast 6 months. Last month I did multiple hpt and one beta blood test and all turned to negative . Last week again I did a blood test and multiple hpt it was negative. From yesterday morning I started getting faint positives in my first morning pee. I also got positive when I keep the bladder full for atleast 4 hours. But all the positives are faint. Could I be pregnant? I used the same brand pee stick since I started testing.

  • By Midwife @Tommys on 1 Dec 2017 - 11:37

    Hi,
    Any positive pregnancy test is taken as confirmation of a pregnancy, it maybe that the pregnancy test is only just picking up a very early pregnancy. It maybe worth repeating the pregnancy test in a week to allow for the hormone levels to rise significantly more to confirm the pregnancy. Your other option would be to see the GP for a blood test which would confirm a pregnancy as this is more sensitive. If you are not already, we would also advise that you are taking a folic acid supplement.

  • By Anonymous (not verified) on 30 Mar 2017 - 18:56

    Ive just found out i am pregnant but want to work out the conception date because there is two different times. One was in my ovulation week that i worked out from my cycle and the other one was 2 weeks later, 2 days before my period was due. I got a positive pregnancy test 2 days after my missed period (which was only 4 days after this second time) will i more than likely have conceived on this first intercourse? Whats the earliest you can get a positive pregnancy test?

  • By Midwife @Tommys on 31 Mar 2017 - 15:07

    Hi,
    It does sound more likely that conception would have occurred during the first time of intercourse however this cannot be guaranteed as there was no period in between.

  • By Precious (not verified) on 25 Mar 2017 - 03:59

    I want to know my due date

  • By Midwife @Tommys on 27 Mar 2017 - 09:13

    Hi Precious, you can use our pregnancy calculator to work out how many weeks gestation you are by using your last menstrual period date and your average menstrual cycle length. (See link below)

    https://www.tommys.org/pregnancy-information/im-pregnant/calculate-your-due-date

  • By Anonymous (not verified) on 23 Mar 2017 - 15:19

    Can i have cough and cold medication while pregnant i am 4 weeks in to the pregnancy.

  • By Midwife @Tommys on 23 Mar 2017 - 16:12

    Hi, It is good practice to consult your GP or midwife before taking any medication in pregnancy, particularly in the first trimester.
    Most coughs and colds resolve on their own and best advice is to drink plenty of fluids, get some rest and eat a healthy diet with plenty of fruit and vegetables. You could also try hot lemon and honey drinks or ginger tea. You may find this link helpful. http://www.nhs.uk/Conditions/Cold-common/Pages/Treatment.aspx
    I hope this helps. Best wishes

  • By Anonymous (not verified) on 17 Mar 2017 - 10:37

    I'm 33weeks pregnant . I have nose bleed since yesterday. Is this normal

  • By Midwife @Tommys on 20 Mar 2017 - 09:16

    Hi there. Yes, nosebleeds do tend to occur more often during pregnancy. Pregnancy can cause the blood vessels in your nose to expand, and your increased blood supply puts more pressure on those delicate vessels, causing them to rupture more easily. If they do not clot and stop, then seek medical attention via GP/walk in centre. But if they are just on and off, then this is nothing to worry about, although inconvenient. Take care of yourself

  • By Anonymous (not verified) on 2 Sep 2016 - 10:41

    Is it normal for ankles to swell early in pregnancy. I am 40, work full time and active.

  • By Midwife @Tommys on 8 Sep 2016 - 09:55

    Hi, some ankle swelling can be normal especially when the weather is warm and you have been active during the day. Try to keep well hydrated and take some time to rest, elevating your legs. If you sit for large parts of the day for work then try flexing your feet up and down regularly and stretching out your legs. If one leg is more swollen than the other then see your GP for a review. If the swelling continues it is worth seeing your midwife for an antenatal check for BP and urine review, though this is more applicable if you are in your second or third trimester. If you would like further advice please call on 0800 0147 800

  • By Midwife @Tommys on 10 Aug 2016 - 14:40

    It is not possible to ascertain if you in early or late pregnancy from the information provided, however I will presume you are in the first trimester. It is not uncommon to have some spotting in the first trimester and some of the harmless causes are an implantation bleed (as the fetal sac settles into the womb) and on intercourse when a cervical erosion may have been the cause . If the bleeding persists and you start to develop abdominal pain, it may unfortunately mean you are miscarrying, with most miscarriages occurring within the first 12 weeks of pregnancy. If this occurs you should seek medical help. If you are concerned please contact one of our Midwives on the pregnancy helpline on 0800 0147 800. We are here from Monday to Friday from 9am till 5pm & happy to have a chat with you to help alleviate your concerns

  • By Anonymous (not verified) on 10 Aug 2016 - 07:52

    I had a little blood lst normal pls. Thanks

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