Pregnancy Due Date Calculator

Estimate your baby's birth date and track important pregnancy milestones

Track your pregnancy milestones with our accurate due date calculator

How to Use This Calculator

1. Enter the first day of your last menstrual period (LMP)
2. Input your average cycle length (default is 28 days)
3. Click "Calculate Due Date" to see your results
4. View your estimated due date along with conception date and trimester timeline

This calculator uses standard medical calculations to estimate your due date based on Naegele's rule. Remember that only about 5% of women deliver on their exact due date.

First day of your last menstrual period:

Average length of your menstrual cycle (days):

Your Pregnancy Timeline

Due Date:

Conception Date:

End of First Trimester:

End of Second Trimester:

Current Gestational Age:

Understanding Your Results

Due Date: This is the estimated date when your baby will be born (40 weeks from your LMP). Most babies are born within 2 weeks before or after this date.

Conception Date: This estimates when fertilization likely occurred, typically about 11-21 days after the first day of your LMP.

Trimesters: Pregnancy is divided into three phases, each with important developmental milestones for your baby.

First Trimester

Weeks 1-12

Early development, morning sickness common

Second Trimester

Weeks 13-26

Baby's movements felt, lower miscarriage risk

Third Trimester

Weeks 27-40

Rapid growth, preparation for birth

Note: This calculator provides estimates only. Always consult with your healthcare provider about your pregnancy.