Pregnancy Tools
Baby Due Date Calculator
Calculate your due date and see how big your baby is each week with our fun fruit size comparison.
Let's find out
When is your baby due?
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Your journey starts here
Enter your details to see your baby's progress
How is my due date calculated?
Most pregnancies last around 40 weeks (280 days) from the first day of your last menstrual period. Our calculator uses Naegele's rule.
Baby size by week
Comparing your baby to fruits is a fun way to visualize their growth! From a tiny poppy seed at 4 weeks to a pumpkin at 40 weeks.
Track milestones with Aanvi
Once your baby arrives, Aanvi helps you capture their first laugh, first steps, and every sweet moment in a shared family journal.
Common Questions
- How is a pregnancy due date calculated?
- A due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is known as Naegele's rule. Most healthcare providers use this method, though ultrasound dating in the first trimester can adjust it by up to two weeks.
- How accurate are due date calculators?
- Only about 5% of babies are born on their exact due date. Most arrive within a two-week window around the estimated date. First-trimester ultrasound dating is accurate to within 5-7 days, while LMP-based calculations can vary more depending on cycle regularity.
- Can my due date change during pregnancy?
- Yes. If an early ultrasound shows your baby measuring differently from the LMP-based date, your provider may adjust it. Practices vary — discuss any dating questions with your OB or midwife.
- What is a pregnancy fruit size comparison?
- Fruit size comparisons help parents visualize their baby's growth each week. For example, at 8 weeks a baby is roughly the size of a raspberry, at 20 weeks a banana, and at 40 weeks a small watermelon. These are approximate size references, not exact measurements.
For educational purposes only — not a substitute for professional medical advice. Always consult your pediatrician with questions about your child's health.