Due Date Calculator
Calculate your estimated due date based on your last menstrual period (LMP), conception date, or ultrasound date. Get weekly pregnancy updates and milestone tracking.
From Last Menstrual Period
From Conception Date
From Ultrasound Date
About Due Dates
- Estimated Due Date (EDD) — The date your baby is expected to be born, calculated from various starting points
- LMP Method — Standard method; assumes a 28-day cycle with ovulation on day 14
- Ultrasound Dating — Most accurate in the first trimester (±3-5 days); less accurate later in pregnancy
- Normal Variation — Babies born within 2 weeks before or after the EDD are considered on time
- Full Term — 37 weeks or later; premature if before 37 weeks
Pregnancy Timeline
Early (Weeks 1-8)
Conception to 8 weeks; often missed period
Conception to 8 weeks; often missed period
First Trimester (Weeks 9-13)
First ultrasound, prenatal screening
First ultrasound, prenatal screening
Second Trimester (Weeks 14-27)
Rapid growth, gender reveal scan
Rapid growth, gender reveal scan
Third Trimester (Weeks 28-40)
Final development, preparing for birth
Final development, preparing for birth