Beräknad förlossningsdatum kalkylator
Granskad av Patient infomatics teamSenast uppdaterad av Patient infomatics teamLast updated 7 May 2026
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This pregnancy due date calculator will give you a rough idea of when your baby should be born. If you know the date of the first day of your last menstrual period (LMP), or have already had your first ultrasound scan, you can use this tool. Please remember that the result will not necessarily be the day that your baby arrives. The actual date may be any time from 38 to 42 weeks in most pregnancies. If problems occur you may be advised that delivering your baby earlier is the safest option.
For advice on recognising signs that you are going into förlossning, or for information on some types of pain relief in labour, follow the links. We also have information on how your baby is monitored in labour.
Anmäl dig till vår gratis 8-veckors kurs om en hälsosam graviditet!
Varje vecka delar vi användbar information och viktiga tips om ämnen som näring, motion, mental hälsa, symtom att vara uppmärksam på och förberedelser inför förlossningen, för att hjälpa dig navigera din graviditetsresa oavsett vilket stadium du befinner dig i.
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Video picks for General pregnancy information
Visit our Pregnancy Hub for trusted advice, week-by-week guidance, expert articles, and answers to all your pregnancy questions.
Explore now → patient.info/pregnancy
How does the pregnancy due date calculator work?
Our pregnancy calculator uses the date of your last menstrual period (LMP) to estimate your due date. It assumes a typical 28-day cycle, with ovulation happening around day 14.
If you know the exact date of conception, you can enter that instead, though for many people, the LMP is a more practical reference.
Pregnancy is estimated to last 280 days (40 weeks) from the first day of your last period. Your due date is not an exact science, but it gives you a useful timeframe for planning antenatal care and preparing for birth.
Can I use the calculator if my cycle is irregular?
Yes, but if your cycle is significantly shorter or longer than 28 days, it may affect the estimated due date. For the most accurate results, use:
The date of conception (if known)
An early ultrasound scan, which is often more reliable for dating your pregnancy
If you're unsure, speak to your midwife or GP who can offer guidance based on your personal history and scan results.
Is my due date guaranteed?
Not exactly, only around 5% of babies are born on their due date. Most arrive between 37 and 42 weeks of pregnancy. Your due date is best seen as a guide to help track your baby’s development and prepare for labour.
Your midwife or doctor will update your estimated due date if needed, especially after a dating scan in your first trimester.
Patient picks for General pregnancy information
Graviditet
Infertility
Infertility means difficulty in conceiving naturally (becoming pregnant) despite having regular unprotected sex when not using contraception. There is no definite cut-off point to say when a couple is infertile. Many couples take several months to conceive. About 84 couples out of 100 conceive within a year of trying. About 92 couples out of 100 conceive within two years. Looking at this another way, about 1 in 7 couples do not conceive within a year of trying. However, more than half of these couples will conceive over the following year, without any treatment. Doctors usually suggest some tests if a couple has not conceived after one year, despite regular sexual intercourse. Tests or treatment may start earlier if the woman is older, or if there is an obvious reason why a particular couple will not conceive, however long they try. It is usually worth seeing your doctor if you have not conceived after one year of trying. A doctor can check for some common causes, talk things over and discuss possible options. You may want to see your doctor earlier, if the woman in the couple is over the age of 36 or if either partner has a history of fertility problems, or a condition such as endometriosis or polycystic ovarian syndrome which are known to be linked with fertility problems.
av Dr Toni Hazell, MRCGP
Graviditet
Abortion
Abortions are performed up to the 24th week of pregnancy (23 weeks and 6 days is the legal limit). They can be done medically (with tablets) or surgically (a procedure in an operating room). Most women are well afterwards. There is no evidence that having an abortion reduces your chances of having a family when the time is right.
by Dr Hayley Willacy, FRCGP
Anmäl dig till vår gratis 8-veckors kurs om en hälsosam graviditet!
Varje vecka delar vi användbar information och viktiga tips om ämnen som näring, motion, mental hälsa, symtom att vara uppmärksam på och förberedelser inför förlossningen, för att hjälpa dig navigera din graviditetsresa oavsett vilket stadium du befinner dig i.
By subscribing you accept our Sekretesspolicy. Du kan avsluta prenumerationen när som helst. Vi säljer aldrig dina uppgifter.
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About the authorView full bio
Patientinformatikteamet
The Patient.info Informatics Team ensures our medical content and tools are accurate, evidence-based, and aligned with trusted NHS and NICE guidance.
About the reviewerView full bio
Patientinformatikteamet
The Patient.info Informatics Team ensures our medical content and tools are accurate, evidence-based, and aligned with trusted NHS and NICE guidance.
Artikelhistorik
Informationen på denna sida är skriven och granskad av kvalificerade kliniker.
Next review due: 7 May 2026
7 May 2026 | Senaste versionen
7 May 2026 | Ursprungligen publicerad
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