Due Date Calculator
Predict your baby's due date with precision — 4 methods supported
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Medical Disclaimer: This calculator provides estimates based on standard pregnancy calculations. Results may vary and should not replace professional medical advice. Always consult with your healthcare provider for personalized pregnancy care.
Our free Due Date Calculator predicts your baby's due date using four methods — Last Menstrual Period, Conception Date, IVF Transfer, and Ultrasound. Enter your details, click Calculate, and instantly see your due date, current pregnancy week, trimester, progress percentage, and a complete trimester timeline.
How to Use This Calculator
1
Select your calculation method — Last Period, Conception, IVF Transfer, or Ultrasound.
2
For Last Period, enter your LMP date and average cycle length. Default cycle is 28 days.
3
For IVF, enter your transfer date and select your embryo type — Day 3, Day 5, or Day 6.
4
For Ultrasound, enter the scan date and gestational age in weeks and days as given by your doctor.
5
Click Calculate Due Date to see your results — due date, current week, trimester, and pregnancy progress bar.
Which Method Should You Choose?
| Method | Best When | Accuracy |
|---|---|---|
| Last Menstrual Period | You know your LMP date and have regular cycles | Good |
| Conception Date | You know the exact date you conceived | Good |
| IVF Transfer | You conceived through IVF with known transfer date | Very Good |
| Ultrasound | You have a first-trimester scan with gestational age | Most Accurate |
Frequently Asked Questions
LMP-based due dates are a reliable starting point but assume a standard 28-day cycle with ovulation on day 14. If your cycles are irregular or longer than 28 days, the result may be off by a week or more. An early ultrasound between 6 and 10 weeks is recommended to confirm or adjust the date.
Yes. If your first-trimester ultrasound shows a gestational age that differs by more than 7 days from your LMP-based estimate, your doctor will typically update your due date to match the scan. Use the Ultrasound method in this calculator to recalculate with your updated information.
Full term begins at week 37. Babies born between weeks 37 and 42 are considered full term. Before week 37 is premature and after week 42 is post-term. Your due date at week 40 is the midpoint of the normal delivery window — not an exact deadline.
For IVF pregnancies the due date is calculated from the embryo transfer date. A Day 3 embryo transfer adds 263 days, a Day 5 blastocyst adds 261 days, and a Day 6 blastocyst adds 260 days. Because the exact fertilization timeline is known, IVF dating is more precise than LMP-based calculations.
Want the Complete Due Date Prediction Guide?
Read our full guide covering all four methods, trimester breakdowns, IVF dating explained, and tips for every stage of your pregnancy.