Pregnancy Due Date Calculator- Find Out When You Are Due

Find Your Pregnancy Due Date

If you’re in need of an ovulation predictor or pregnancy due date calculator, we’ve got you covered. Just enter the date of your last menstrual period to calculate either.  You’ll receive dates for when you are the most fertile and if already pregnant, your pregnancy due date.  Congratulations if that is the case!

A baby can be born within two weeks on either side of the due date to be considered on time.



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:



Calculating Your Due Date

Calculating a pregnancy due date is an important aspect of prenatal care. It helps expectant mothers and healthcare providers to monitor the growth and development of the baby and plan for the delivery. While due dates are estimates and not always exact, they provide a general timeline for when the baby is expected to arrive.

The most common method for calculating due dates is known as the Naegele’s rule. This rule assumes that a woman’s menstrual cycle is 28 days long and that ovulation occurs on day 14. Using this method, the due date is calculated by adding 280 days (or 40 weeks) to the first day of the woman’s last menstrual period. For example, if the first day of the last menstrual period was January 1st, the due date would be October 8th (January 1st + 280 days).

However, not all women have a 28-day cycle or ovulate on day 14. In these cases, other methods may be used to calculate the due date. One such method is ultrasound dating, which uses measurements of the baby’s size to estimate the due date. This method is especially useful in the first trimester when the baby is still developing rapidly.

Another method is known as the Ballard score, which assesses the baby’s physical development and maturity to estimate the due date. This method is often used in cases where the mother’s menstrual cycle is unknown or the baby is not developing at the expected rate.

It’s important to note that due dates are estimates and not always exact. Only 5% of babies are born on their actual due date, while the majority are born within two weeks before or after the due date. It’s also possible for a baby to be born prematurely or postmaturely, which can affect the timing of the delivery.

Baby’s Growth and Development in Pregnancy

In addition to calculating your baby’s due date, healthcare providers also monitor the baby’s growth and development throughout the pregnancy. This includes measuring the size of the uterus, checking the baby’s heart rate, and performing regular ultrasound exams.

If there are concerns about the baby’s growth or development, additional testing may be done to ensure that the baby is healthy and receiving the proper nutrients. In some cases, labor may be induced or a cesarean section may be performed if there are concerns about the baby’s health or the mother’s ability to deliver vaginally.

While the most common method is Naegele’s rule, other methods such as ultrasound dating and the Ballard score may be used in certain situations. It’s important to remember that due dates are estimates and not always exact, and healthcare providers will monitor the baby’s growth and development throughout the pregnancy to ensure a healthy delivery.

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