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Due Date Calculator

Find out when your little one is due with our calculator.

When was the first day of your last period?

For example, 22/06/2022

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It looks like your dates are too far in the past

Please enter a valid date

How long is your cycle?

Everybody’s different - tell us how many days your cycle lasts on average

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It looks like your dates are too far in the past

Please enter a valid cycle length

How to use our

Due Date Calculator

1. Check your calendar and tell us the first day of your last period
2. Enter your average cycle length – this could be more or less than 28 days
3. Click ‘Tell me my due date’ and we’ll give you an estimated date

How do we calculate...

your due date?

An expected date of delivery can be between 37 weeks to 42 weeks, and starts from the first day of your last period, so we use your menstrual cycle to work out an estimated due date with our pregnancy calculator.

At around 10 to 14 weeks of pregnancy you’ll be invited for your first ultrasound which is called a dating scan, during the scan the doctor will measure your baby and give you a more accurate date based on your baby’s size. Sometimes your due date may be different from the one you’ve been given based on your cycle, this isn’t always an accurate prediction as babies can come in all different shapes and sizes!

Starting your pregnancy journey…

What's next?

If you have taken a pregnancy test and you think you might be pregnant, it’s important to speak to your doctor as soon as possible. Your doctor will give you a pregancy blood test to check for pregnancy.

Your doctor will then talk you through your next steps. They’ll go through your medical history and be able to advise on everything from your diet to any vitamins you may need.

More about pregnancy

You may experience some very early pregnancy symptoms even after 1 week of conception. Some symptoms that may show up before your missed period may be tender/swollen breasts and a sensitivity to smell or spotting, which might appear around one week after a sperm meets an egg. Other early signs of pregnancy can be nausea with or without vomiting, increased urination and fatigue.
If you believe you are pregnant your doctor can give you a blood pregnancy test as early as 11 to 14 days after your ovulation. The blood test results will typically come out a few days later. False negatives can happen if your blood test is taken too early. The hCG hormone will only show up in the blood a week or two after conception. The doctor can repeat the blood test again in a few days if a woman strongly believes she is pregnant.
You may have gotten early signs of pregnancy or taken a pregnancy test after a missed period to see if you are pregnant. And now you are wondering how many weeks pregnant you are?

You can calculate this through a pregnancy due date calculator. Most doctors calculate your baby’s estimated due date by looking at the first day of your last menstrual period (LMP). In Oman on average most pregnancies last around 40 weeks or 38 weeks from conception.

If your period comes regularly and your average cycle lasts 28 days and if your ovulation usually happens on day 14 of your cycle, your conception probably happened two weeks after your last menstrual period (LMP).

The most common way to calculate your pregnancy due date is by counting 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). You can also minus 3 months from the first day of your last period and add seven days.

However, this is only an estimated pregnancy due date and may vary on multiple factors. Only 4 percent of babies are actually born on their estimated due date.
You can calculate your pregnancy due date using the Hijri calendar. In order to do this, you need the first day of your last menstrual period (LMP) according to the Hijri year. You can then calculate your Hijri pregnancy due date by counting 40 weeks or 280 days from the first day of your last period. On average most pregnancies last for around 40 weeks.
Another way to calculate your pregnancy due date is if you know what date you conceived. On average for most women with regular periods, conception can typically occur at 11-21 days after the first day of your last period. However, it can be challenging to know exactly when ovulation occurs. You may have been tracking your ovulation symptoms, used ovulation test strips or even through a fertility tracker app. If you have calculated when you conceived, add 266 days to this date to get your estimated pregnancy due date.
If you have conceived through IVF (in vitro fertilization), you can calculate your pregnancy due date using the date you did your IVF transfer, which is when the doctor implanted the fertilized egg into your uterine wall. On average fresh or frozen embryo transfers either occur three days or five days after your egg retrieval and fertilization. If you had a day 3 embryo transfer, add 263 days to the transfer date to calculate your due date. Or if you had a day 5 embryo transfer, add 261 days to the transfer date to calculate your due date.
If you are not sure when you conceived, forgot the day of your last menstrual period (LMP) and you are not sure when you ovulated, but you have gotten a positive pregnancy test there are other ways your doctor can determine your pregnancy due date. This can be confirmed at your first prenatal appointment.

Your doctor may perform an early ultrasound, which can accurately date the pregnancy. Your first ultrasound will be taken between 7 and 8 weeks of pregnancy, and you will also find out if you are having one baby, twins or even more.

Another way to find out your due date is when the baby’s first heartbeat is heard (around week 9 or 10 weeks, though it can vary) as well as another pregnancy milestone, like when you first feel fetal movement. On average this can be between 18 and 22 weeks of pregnancy, but it can vary. Additionally, the size of your uterus can be a factor that pinpoints your estimated due date. The measurement of your uterus will be checked during your initial internal pregnancy exam.

For IVF patients, the first ultrasound is scheduled at around 4 to 5 weeks after an embryo transfer and this makes it about the sixth or seventh week of pregnancy. However, an ultrasound would be performed earlier if an ectopic pregnancy is suspected. In such cases an ultrasound would take place about three and a half weeks after an embryo transfer.
If you are trying to plan your pregnancy within a specific season or month you can try to time when you conceive using an ovulation calculator. This will allow you to track the date of your last menstrual period (LMP) and your average cycle length to help find out the days you are most likely to be fertile on. This may increase your chances to conceive and you may be one of the lucky ones to get pregnant when they really want to. Your due date will typically be 40 weeks after the day you started your last period. However, you may not be able to plan exactly when you will give birth or the exact pregnancy due date, as ovulation isn’t always accurate and can happen earlier or later in the month, which will move your due date.
Due dates can change. Your doctor may change your due date for a number of reasons as your pregnancy progresses and it is not a reason to be concerned. One reason your pregnancy due date may change is if you have irregular periods and your early ultrasound dating was off, or if your first ultrasound was taken in your second trimester. At 12 weeks your ultrasound scan will be more accurate.

Other reasons could be that your funal height is abnormal, or your levels of alpha-fetoprotein (AFP), a protein made by the baby, are outside the usual range. Speak to your doctor if you have any questions or concerns always.