Pregnancy Due Date Calculator
Pregnancy Calculator
Advanced Pregnancy Due Date Calculator
Estimate your due date, find out your baby's size, and see your key milestones.
Pregnancy is an exciting journey full of numbers and dates. Whether you just got your positive test or you are tracking your third trimester, knowing "How far along am I?" is the first question every parent asks.
Our Advanced Pregnancy Calculator above goes beyond simple math. It helps you calculate your due date using four different medical methods (LMP, Conception, IVF, or Ultrasound) and creates a personalized timeline for your pregnancy journey.
More Than Just a Due Date Calculator
Most calculators only give you a date. Ours gives you a complete dashboard of your pregnancy.
- 🥑 Baby Size by Fruit: Visualizing "14 weeks" is hard. Knowing your baby is the size of a Lemon makes it real. We track your baby's size from a Poppy Seed to a Pumpkin.
- 📅 Milestone Timeline: Automatically calculates key future dates, such as when your first trimester ends (12 weeks) and when your anatomy scan should happen (20 weeks).
- ♈ Baby Zodiac Sign: A fun feature that predicts your baby's star sign based on their estimated arrival date.
How to Calculate Your Due Date
Doctors use different methods depending on what information is available. Our tool supports all of them:
1. By Last Menstrual Period (LMP)
This is the most common method. Pregnancy is calculated from the first day of your last period, not the day you conceived. This method assumes a 28-day cycle, but our calculator allows you to adjust your cycle length for better accuracy if you have irregular periods.
2. By Conception Date
If you were tracking ovulation and know exactly when you conceived, this is the most accurate method. It adds 266 days (38 weeks) to your conception date.
3. By IVF Transfer Date
For IVF pregnancies, accuracy is key. You can select your transfer date and whether it was a Day 3 or Day 5 embryo. The calculator adjusts the gestational age accordingly.
Frequently Asked Questions
How accurate is this pregnancy calculator?
While highly accurate based on medical formulas (Naegele's Rule), only about 5% of babies are born on their exact due date. Most are born within the two weeks before or after.
Can I calculate my due date if I have irregular periods?
Yes. If you use the LMP method, adjust the "Cycle Length" field in the calculator. If your cycles vary widely (e.g., 25 to 40 days), an early ultrasound is usually the best way to date the pregnancy.
When does the second trimester start?
The second trimester begins at week 13 or 14, depending on your provider's preference. Our calculator timeline marks the end of the first trimester at 12 weeks.