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Use our Due Date Calculator to estimate your baby’s arrival accurately. Simple, fast, and easy pregnancy due date estimation tool.

What is a Due Date?

A due date is an estimated day when your baby is expected to be born. Typically, pregnancy lasts about 40 weeks from the first day of your last menstrual period (LMP). Knowing your due date helps you plan prenatal care, prepare for delivery, and track the progress of your pregnancy week by week.

How to Calculate Your Due Date

There are several methods to calculate your estimated due date (EDD):

  • Naegle’s Rule: Add 280 days (40 weeks) to the first day of your last menstrual period (LMP).
  • Ultrasound Scan: Early pregnancy ultrasound can provide a more accurate EDD by measuring the size of the fetus.
  • Conception Date: If known, add 266 days to your conception date.

Keep in mind that these methods provide an estimate; babies can be born earlier or later than the predicted date.

Factors Affecting Accuracy

Several factors can influence the accuracy of a due date:

  • Irregular menstrual cycles
  • Late ovulation
  • First trimester bleeding
  • Multiple pregnancies (twins or more)
  • Medical conditions affecting fetal growth

These factors highlight why the due date is an estimation rather than an exact prediction.

Using a Due Date Calculator

Our online Due Date Calculator simplifies the process. Simply enter the date of your last menstrual period and your average cycle length, and the tool will calculate an estimated delivery date. It also provides a week-by-week pregnancy timeline to help you track your baby’s development.

This tool is easy to use, accurate for most pregnancies, and can be accessed on both desktop and mobile devices.

Tips for a Healthy Pregnancy

  1. Attend regular prenatal check-ups with your doctor.
  2. Eat a balanced diet rich in vitamins and minerals.
  3. Take prenatal vitamins with folic acid.
  4. Stay hydrated and exercise safely.
  5. Avoid alcohol, smoking, and harmful substances.
  6. Monitor fetal movements and report concerns to your doctor.
  7. Prepare mentally and physically for childbirth and breastfeeding.

Frequently Asked Questions (FAQ)

Q1: How accurate is a due date calculator?

A: Most due date calculators provide a good estimate, but only 5% of babies are born on their exact due date. Variations of 1–2 weeks are common.

Q2: Can the cycle length affect my due date?

A: Yes. A longer or shorter menstrual cycle can shift the estimated delivery date slightly. Calculators often allow you to adjust for cycle length.

Q3: Can I calculate my due date without knowing my LMP?

A: If you do not know your last menstrual period, early pregnancy ultrasound can estimate gestational age and due date more accurately.

Q4: Is it possible to change the due date?

A: The due date can be adjusted if new medical information arises, such as ultrasound measurements, but it remains an estimate.

Q5: What should I do if I go past my due date?

A: Going past your due date is common. Doctors monitor both you and the baby and may discuss induction options if necessary.

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