Our Pregnancy Due Date Calculator uses Naegele's Rule to estimate your delivery date. By entering the first day of your last period and your average cycle length, we can calculate your baby's due date, conception date, and current gestational age (weeks and days pregnant).
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Calculate Your Estimated Due Date
Find your estimated due date based on your last menstrual period (LMP) and cycle length. Track your pregnancy progress week by week. Fast, free, and private.
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Your Dates
Note: This calculator uses Naegele's Rule. Only an ultrasound can confirm the exact gestational age.
Pregnancy Calculator
Enter the first day of your last period to calculate your due date.
About Calculate Your Estimated Due Date
1
Enter LMP
Select the first day of your last menstrual period on the calendar.
2
Cycle Length
Enter your average cycle length (usually 28 days).
3
View Timeline
See your estimated due date and current pregnancy progress.
Key Features
Custom Cycle Length
Adjusts calculations for cycles shorter or longer than the standard 28 days for better accuracy.
Pregnancy Timeline
Shows your current trimester, weeks pregnant, and progress towards your due date.
Key Milestones
Identifies important dates like the end of the first trimester and full term.
Frequently Asked Questions
This calculator provides an estimate based on the standard 40-week gestation period. Only about 5% of babies are born on their exact due date.
It's the standard method used by doctors to estimate a due date: Add 7 days to the first day of your LMP, then subtract 3 months.
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