Enter the first day of your last menstrual period (or your conception date, ultrasound date, or IVF transfer date) and the Due Date Calculator estimates your baby's due date, current gestational age, and trimester. You also get your estimated conception date and how many weeks remain until delivery.
Estimated Due Date
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Current Gestational Age
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Current Trimester
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Weeks Remaining
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Estimated Conception Date
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The most common method uses the first day of your last menstrual period (LMP). Adding 280 days (40 weeks) gives your estimated due date. This assumes a 28-day cycle with ovulation on day 14. If your cycle length differs, the calculator adjusts accordingly. Other methods use conception date, ultrasound measurements, or IVF transfer dates.
Your due date is an estimate, not a guarantee. Only about 4–5% of babies are born exactly on their due date. Most births occur within two weeks before or after. Early ultrasounds (before 14 weeks) are generally the most accurate method for confirming gestational age.
Yes. Your healthcare provider may revise your due date based on ultrasound measurements, especially in the first trimester. If the ultrasound date differs significantly from your LMP-based date, your provider may update it. Changes are most common early in pregnancy.
Your estimated due date (EDD) is the predicted date your baby will be born, calculated at approximately 40 weeks of pregnancy. It helps you and your healthcare team plan prenatal care, monitor fetal development, and prepare for delivery.
A full-term pregnancy is 40 weeks (280 days) from the first day of your last menstrual period. Babies born between 39 and 40 weeks and 6 days are considered full-term. Those born at 37–38 weeks are early-term, and those at 41–41 weeks 6 days are late-term.
For a 3-day IVF embryo transfer, 263 days (38 weeks) are added to the transfer date. For a 5-day (blastocyst) transfer, 261 days are added. These adjustments account for the embryo's age at the time of transfer.
Most home pregnancy tests can detect the hCG hormone as early as 10–14 days after conception, or around the time of your missed period. Testing too early may give a false negative. For the most reliable result, wait until the first day of your missed period or later.
If your doctor has already given you a due date, you can use the 'Conception Date' or enter any date method that matches your known information. The calculator will then show your current gestational age, trimester, and weeks remaining based on that date.