Lahalak Medical PlatformDifferentiate Care
Estimate your expected due date in a simple, guided way
Due Date Calculator
LahaLak’s due date calculator helps estimate your expected due date based on your last menstrual period, estimated conception date, IVF transfer date, known due date, or ultrasound-based gestational age. The result is educational only and does not replace medical follow-up.
* Last Menstrual Period (LMP) cycles typically range from 22 to 44 days. 28 days is the average for most women.
This is not a diagnosis. Calculations provided are estimates.
Whether you are trying to get pregnant, already pregnant, preparing to give birth, or caring for a newborn, LahaLak provides educational guidance to help you understand your options and next steps. Content is educational only, and medical decisions should be made with a licensed clinician in Saudi Arabia.
You can contact the LahaLak team for general support or go to booking to explore pregnancy and birth services by city. For emergencies such as bleeding, severe pain, severe dizziness, or shortness of breath, seek emergency care immediately.
Several methods can estimate your due date. The right method depends on the information available: last menstrual period, conception date, embryo transfer date, ultrasound date, or a known due date. Expand to see the primary methods.
The last menstrual period method is one of the most commonly used ways to estimate a due date. It adds 280 days, or 40 weeks, to the first day of the last menstrual period.
This approach often assumes a regular cycle close to 28 days, so it may be less suitable for very irregular, long, or short cycles.
If you know the estimated conception date or tracked ovulation closely, the due date can be estimated by adding about 266 days to conception.
This can be useful with ovulation tracking or some assisted reproduction situations, but it remains an estimate and needs clinical confirmation.
With IVF, the embryo transfer date is known, making this method more specific than relying on menstrual cycle timing.
The calculation varies by embryo age at transfer, such as day three, five, or six. The fertility center and clinician’s plan should guide the final date.
Ultrasound, especially in the first trimester, can help estimate gestational age when the last period date is unknown or cycles are irregular.
The clinician measures fetal growth markers and compares them with expected gestational age. Ultrasound interpretation should be clinical, not calculator-based only.
An estimated due date helps plan visits, tests, and birth preparation, but it is not a guaranteed date.
Cycle length, conception timing, ultrasound findings, and mother-baby health can all affect estimate accuracy.
Yes. The estimated due date may change if tests or ultrasound suggest a different gestational age than the original calculation.
This is more common when cycles are irregular or the last period date is uncertain.
If your clinician has already provided a due date, you can use it to understand your approximate pregnancy age today and connect your journey to follow-up stages.
The clinically approved date remains the reference, especially with high-risk pregnancy or a specific birth plan.
Important note: this information and calculator are educational only and do not provide diagnosis or a treatment plan. In Saudi Arabia, pregnancy follow-up should be with a licensed clinician, especially for high-risk pregnancy or concerning symptoms.
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