Due Date Calculator

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.

Disclaimer: This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions.

Enter the first day of your most recent period.

days

Most cycles are 28 days. Adjust if yours differs.

The date you believe you conceived.

weeks
days

Results

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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Frequently Asked Questions

How is my due date calculated?

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.

How accurate is my estimated due date?

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.

Can my due date change?

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.

What is an estimated due date (EDD)?

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.

How many weeks is a full-term pregnancy?

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.

How is an IVF due date calculated?

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.

How soon can I take a pregnancy test?

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.

What if I already know my due date?

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.