Pregnancy Due Date Calculator – Instantly Calculate Your Due Date
Knowing your baby’s expected arrival date is one of the most exciting moments of pregnancy. With our easy-to-use pregnancy due date calculator, you can quickly find your estimated delivery date by entering the first day of your last menstrual period (LMP) along with your average cycle length. This tool provides a simple and reliable estimate to help you plan prenatal care, track important milestones, and confidently begin your pregnancy journey.
Beyond Simple Math: Understanding Your Due Date
The moment you see those two lines on a pregnancy test, your first question is almost always: "When will I meet my baby?"
While nature has its own timeline, our Mamma Track Calculator bridge the gap between mystery and planning. We don't just count days; we use clinically-backed algorithms to give you a roadmap for your journey ahead.
The Formula We Use
Based on the refined Naegele’s Rule:
Personalized Accuracy
Most calculators assume a 28-day cycle. Mamma Track adjusts based on your unique cycle length for a more precise estimation.
Growth Tracking
Knowing your EDD (Estimated Due Date) allows doctors to monitor if your baby is reaching crucial developmental milestones on time.
Gestational Age
We calculate exactly how many weeks and days you’ve been carrying your little one, helping you understand your body's changes.
Peace of Mind
Preparation is key. From scheduling scans to packing your hospital bag, having a date helps you feel in control of the unknown.
"Every pregnancy is a unique story. While only 4% of babies are born exactly on their due date, this calculation serves as your North Star, guiding you through the magical 40 weeks of development and preparation."
Your Complete Guide Through Pregnancy
Pregnancy is a life-changing experience filled with excitement, questions, and new milestones. Our pregnancy guide is designed to help you stay informed and confident at every stage—from early symptoms and weekly changes to nutrition, health tips, and delivery preparation. With clear, trusted information, you can make better decisions and enjoy a healthier, more comfortable pregnancy journey.
First Trimester
- check_circleEarly pregnancy symptoms and how to manage them.
- check_circleChoosing a healthcare provider and first prenatal visit.
- check_circleNutrition and safe exercises for a healthy start.
Second Trimester
- check_circleFeeling baby's first kicks (quickening).
- check_circleThe mid-pregnancy ultrasound (anatomy scan).
- check_circleTips for a comfortable sleep.
Third Trimester
- check_circleRecognizing signs of labor.
- check_circleCreating a birth plan.
- check_circlePacking your hospital bag.
Postpartum & Newborn Care
- check_circlePostpartum recovery and self-care for mom.
- check_circleBreastfeeding basics and support.
- check_circleNewborn essentials: feeding, sleeping, and diapering.
auto_awesome Pregnancy Insights & Tips
Expert guides to help you navigate your journey.
Baby Movement Not Regular in Second Trimester: Should You Be Worried?
Baby movement not regular in second trimester? Discover what’s normal, what’s not, emotional reassurance, medical facts, and when to worry. A complete pregnancy
Bloating in Early Pregnancy – Natural Remedies, Causes & Emotional Relief for Mothers
Looking for natural remedies for bloating in early pregnancy? Learn causes, emotional impact, safe relief tips, and when to worry. A complete pregnancy wellness
Lower Belly Pain After Eating During Pregnancy – Causes, Relief & Emotional Support
Experiencing lower belly pain after eating during pregnancy? Learn the causes, emotional impact, safe relief tips, and when to worry. A complete guide for expec
Frequently Asked Questions About Pregnancy
Pregnancy often comes with many questions, especially for first-time parents. In this section, you’ll find clear and reliable answers to the most common pregnancy-related concerns—from due date calculation and early symptoms to health tips and preparation for childbirth. These FAQs are designed to help you feel informed, confident, and supported throughout your pregnancy journey.
How does the Mamma Track Due Date Calculator work?
Our calculator uses a refined version of Naegele's Rule, the standard method used by healthcare professionals. It starts with the first day of your last menstrual period (LMP), adds 280 days (which is 40 weeks), and then intelligently adjusts this calculation based on your specific cycle length. Because the standard rule assumes a 28-day cycle, our adjustment provides a more personalized and accurate Estimated Due Date (EDD).
How accurate is a due date calculator?
An LMP-based due date calculator is a highly reliable estimation and serves as the standard starting point for most pregnancies. However, it's important to remember that only about 5% of babies are born on their exact due date. It is more helpful to think of it as a 'due week.' The most precise dating is typically confirmed via an early ultrasound which measures the baby's size (crown-rump length). Your doctor may adjust your EDD based on this first-trimester scan.
What if I have an irregular menstrual cycle or don't know my LMP?
This is very common. If your cycles are irregular, you can input your best average cycle length for a reasonable estimate. However, for highly irregular cycles (e.g., varying by more than a week each month) or if you don't know your LMP date at all, an early ultrasound will provide the most accurate due date. Our calculator is a great starting point, but a doctor's confirmation is always best in these cases.
What do the different milestones in the results mean?
The timeline highlights key dates in your journey:
End of First Trimester (13 Weeks): Marks the completion of the most critical development period and a significant drop in miscarriage risk.
Approximate Viability (24 Weeks): This is the point where a baby has a chance of survival if born prematurely, though they would require significant medical support.
Considered Full Term (37 Weeks): From this week on, your baby's lungs are considered mature and they are ready for birth, even though your due date is still a few weeks away.
How can I share my due date results?
It's easy to share the exciting news! After calculating your due date, simply click the 'Share with Partner' button.
On a mobile device, this will open your phone's native share menu, allowing you to send the results directly through apps like WhatsApp, Messenger, or SMS.
On a desktop computer, it will automatically copy a summary of your results to your clipboard. You'll see a confirmation, and then you can easily paste the message into an email, message, or social media post.
Important Disclaimer
The information provided on Mamma Track is for educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always seek the guidance of your doctor, midwife, or qualified healthcare provider with any questions you may have regarding your pregnancy or medical condition.
The due date and pregnancy progress shown on this website are based on general medical calculations and may vary from actual results.
Mamma Track does not take responsibility for any medical decisions made based on the information provided here. By using this website, you agree that you do so at your own discretion and risk.