Pregnancy Due Date Calculator
About Pregnancy Due Date Calculator
The Pregnancy Due Date Calculator helps you estimate your baby’s expected date of birth. It uses the date of your last menstrual period (LMP) or conception date to calculate your due date and gestational age. This tool provides a simple and reliable way to track your pregnancy timeline.
Formula (Simple Explanation)›
Due Date = Date of Last Period + 280 days (40 weeks)
Pregnancy typically lasts about 40 weeks from the first day of your last menstrual period. This calculator adds 280 days to that date to estimate your due date.
Example:
Input: If your last period started on January 1, 2025
Output: Your estimated due date will be around October 8, 2025.
Steps to Use:
- Enter the first day of your last menstrual period (LMP).
- Select your average cycle length (default is 28 days).
- Click 'Calculate' to see your estimated due date.
- The tool also provides your current pregnancy week and trimester details.
Frequently Asked Questions
How accurate is the Pregnancy Due Date Calculator?›
The calculator provides an estimate based on a standard 28-day menstrual cycle. Actual delivery may vary by up to two weeks before or after the estimated date.
Can I use the calculator if I don’t remember my last period?›
If you don’t know your last period date, use the conception date or ultrasound date for a more accurate estimate.
Why is pregnancy calculated from the last menstrual period?›
Doctors use the first day of your last menstrual period because ovulation and conception usually occur about two weeks later.
What is gestational age?›
Gestational age is the number of weeks that have passed since the start of your last menstrual period. It helps track the development stage of your pregnancy.
Is this calculator safe to use for medical decisions?›
This tool is for informational purposes only. Always consult your doctor or midwife for precise medical advice and pregnancy tracking.