Free Online Pregnancy Due Date Calculator. Estimate your baby’s due date using the first day of your last period or conception date. Fast & accurate results.
Free Online Pregnancy Due Date Calculator. Estimate your baby’s due date using the first day of your last period or conception date. Fast & accurate results.
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This tool provides estimates only and is not a substitute for professional medical advice.
Begin by typing the first day of your last menstrual period (LMP). If you know the conception date, you can use that instead for more accurate results.
If your menstrual cycle is not the standard 28 days, enter your average cycle length. This helps refine your due date estimate based on your personal cycle pattern.
Press the calculate button to instantly view your estimated due date, pregnancy week, and trimester. You’ll also see how many days remain until your expected delivery.
Find your estimated baby’s arrival date instantly! Enter the first day of your last menstrual period (LMP) or date of conception, and our Pregnancy Due Date Calculator will show your expected due date, current week, and trimester. Designed for expecting mothers, doctors, and midwives to track pregnancy easily and accurately.
The Pregnancy Due Date Calculator helps you estimate when your baby is likely to arrive based on key inputs such as your Last Menstrual Period (LMP) or Conception Date.
Once you enter these details, the tool automatically calculates your due date, current week of pregnancy, and trimester stage using standard medical formulas.
Here’s how each option works:
LMP Method: Calculates your due date by adding 280 days (40 weeks) to the first day of your last period.
Conception Method: Adds 266 days (38 weeks) from the known conception date for a more precise result.
Both methods help expectant mothers monitor pregnancy progress, track growth stages, and prepare for delivery with confidence.
There are several reliable ways to estimate your due date depending on how your pregnancy was conceived or tracked.
This is the most common and simple method. By adding 280 days (9 months and 7 days) to the first day of your last period, you get an estimated delivery date.
It assumes a 28-day cycle, so if your cycles are longer or shorter, your due date may vary slightly.
If you’ve tracked ovulation or know when conception occurred, this method is more accurate. The calculator adds 266 days from that date to estimate your baby’s arrival.
This is ideal for women who used fertility tracking apps or ovulation kits.
For pregnancies conceived via IVF, accuracy is even higher because the embryo transfer date is known.
Day 3 embryo transfer: Add 263 days
Day 5 embryo transfer: Add 261 days
This method eliminates the uncertainty of ovulation or irregular cycles.
If you’re unsure of your LMP or conception date, an ultrasound scan in the first trimester is often the most accurate way to estimate your due date.
Early scans measure fetal size to determine gestational age, making this method reliable even for women with irregular cycles.
A due date is an estimate, not an exact prediction. Most babies arrive between 38–42 weeks, and only about 5% are born on the exact date.
Factors like menstrual cycle length, ovulation timing, and individual health all affect accuracy.
Ultrasound and IVF-based calculations are typically more precise since they use specific developmental or transfer dates.
Our calculator follows the standard 280-day (40-week) pregnancy cycle. Whether you input your LMP or conception date, it provides an accurate due date based on medical guidelines.
Instantly see which trimester you’re currently in and how many weeks are remaining. This helps plan medical visits, lifestyle adjustments, and baby preparation more efficiently.
Completely free and available anytime — just enter your dates, click “Calculate,” and view your pregnancy timeline instantly. Works perfectly on mobile devices for moms on the go.
It’s an online tool that estimates your baby’s expected birth date using your last menstrual period or conception date. It’s based on the standard 40-week pregnancy cycle.
Most pregnancies last between 38–42 weeks. The calculator gives a close estimate, but actual delivery can vary depending on health, ovulation timing, and baby development.
The due date is typically 280 days (40 weeks) from the first day of your last period. Alternatively, it can be calculated as 266 days from the conception date.
Yes, but results may be slightly less precise. For irregular cycles, consider using your conception date if known for better accuracy.
If you conceived through IVF or assisted reproduction, use your embryo transfer or retrieval date — most clinics provide this information for accurate calculation.
You only need the first day of your last menstrual period or conception date. Optionally, you can include your average cycle length for refined accuracy.
Doctors often confirm due dates using ultrasounds that measure fetal growth. Small differences are normal since natural conception dates can vary.
Yes! Even if you’re already pregnant, entering your LMP shows how many weeks you’ve completed and how long remains until delivery.
It’s great for planning and general tracking, but always consult your healthcare provider for clinical confirmation and prenatal guidance.
Absolutely! The Free Tool Mart Pregnancy Due Date Calculator is 100% free, ad-free, and accessible on all devices — no downloads or sign-ups required.
Free Tool Mart offers helpful, easy-to-understand resources for every stage of motherhood — from conception to postpartum care.
Visit the Pregnancy Information Center for quick answers, practical health tips, and week-by-week guidance written with care for new and expecting mothers.
Join thousands of users who trust Free Tool Mart for accurate calculations and reliable tools. Start using our free calculators today!
Free Tool Mart provides free online calculators and tools for education and information only. Results are not professional financial, legal, or medical advice. Always verify with experts.
Free Tool Mart provides free online calculators and tools for educational and informational purposes. Results should be verified and are not intended as professional financial, legal, or medical advice. Always consult qualified professionals for important decisions.