Your Pregnancy Journey Begins Here
Discover your estimated due date and start planning for your little one’s arrival
Due Date Calculator
Find out when to expect your bundle of joy
Your Pregnancy Timeline
Mark your calendar for this special day!
About Pregnancy Due Dates
Our pregnancy due date calculator helps expectant parents estimate when their baby will arrive. By simply entering the first day of your last menstrual period (LMP), our calculator provides an estimated due date based on the standard 40-week pregnancy calculation method used by healthcare professionals worldwide.
How Due Dates Are Calculated
In medical practice, pregnancy due dates are typically calculated using Naegele’s rule, which adds 280 days (40 weeks) to the first day of the woman’s last menstrual period. This method assumes:
- A regular 28-day menstrual cycle
- Ovulation occurring on day 14
- Conception occurring shortly after ovulation
Ultrasound vs. LMP Dating
If you’ve had an early ultrasound, you might notice the due date differs slightly from your LMP-based calculation. Ultrasound dating is often more accurate because:
- It measures fetal development directly
- First trimester ultrasounds are particularly precise
- It doesn’t rely on memory of menstrual dates
Frequently Asked Questions
How accurate is this due date calculator?
Our calculator provides the same initial estimate your healthcare provider would calculate based on your last menstrual period. However, only about 5% of women deliver on their exact due date. The calculation is most accurate for women with regular 28-day cycles who ovulate around day 14.
What if I don’t remember my last period date?
If you’re unsure about your last menstrual period date, you can:
- Check your calendar or period tracking app
- Recall when you got a positive pregnancy test
- Ask your doctor for an ultrasound dating scan
- Estimate based on when you think conception occurred
My cycle isn’t 28 days – what should I do?
If your menstrual cycle is consistently longer or shorter than 28 days, you can adjust by:
- Adding or subtracting days based on your cycle length
- Using ovulation-based calculations if you tracked ovulation
- Getting an early ultrasound for more precise dating
Ready to Meet Your Little One?
Calculate your due date now and start planning for the most exciting journey of your life!
Calculate AgainDisclaimer: The calculators and tools on icalcnow.com are for informational purposes only and do not constitute financial advice. Please consult a professional before making any decisions.