Due Date Calculator
Calculate your baby’s due date, pregnancy week count, and prenatal timeline with clinically referenced formulas—LMP, conception date, IVF transfer, or ultrasound.
Due date preview
June 3, 2025
Calculated with Naegele’s rule, IVF conversions, and cycle length adjustments.
Weeks pregnant today
17 weeks 4 days
Updates daily so you always know exactly how many weeks pregnant you are.
Next milestone
Anatomy scan at 20 weeks
See upcoming prenatal screenings and questions to ask your provider.
Select a dating method and enter a recent date to unlock your personalized pregnancy timeline and appointment checklist.
How to use this due date calculator
Pick the dating method your provider uses, enter the relevant date, and view your pregnancy timeline instantly.
- Select LMP, conception, IVF transfer, or ultrasound to match your records.
- Provide the date (and embryo type or gestational age if asked).
- Review your baby’s due date, how many weeks pregnant you are, and the upcoming prenatal milestones.
Why expecting families and birth professionals trust this due date calculator
Switch between medically accepted dating methods, monitor how many weeks pregnant you are, and stay ahead of key prenatal milestones.
- Accurately adjusts for LMP, conception, IVF embryo transfer, and ultrasound re-dating so every scenario is covered.
- Translates each input into an up-to-the-minute pregnancy week count and countdown, answering “how many weeks pregnant am I?” instantly.
- Highlights upcoming prenatal appointments—from first trimester scans to glucose screening—so every milestone stays on schedule.
- Runs entirely in your browser for privacy while making it easy to copy or share results with your care team.
- • Applies Naegele’s rule and IVF embryo tables recommended by reproductive endocrinologists.
- • Accepts irregular cycle lengths and ultrasound gestational ages for more precise dating.
- • Highlights the prenatal screenings and conversations to plan for in each trimester.
Medical review & currency
Content reviewed by board-certified obstetricians and aligned with ACOG/SMFM pregnancy dating guidance. Always discuss personalised recommendations, induction timing, or complications with your clinician.
Last reviewed: March 2025
What your due date means in every trimester
Use these evidence-backed checkpoints to prepare for prenatal conversations and screenings. Always confirm timing with your clinician.
Weeks 4–13
First trimester foundation
Confirm the pregnancy, establish care, and review early screening options while the embryo is developing vital organs.
- •Book your first prenatal visit by week 8 to review medical history and baseline labs
- •Continue folic acid supplementation (400–800 mcg daily) per CDC guidance
- •Discuss first trimester genetic screening, such as nuchal translucency or NIPT between weeks 10–13
Weeks 14–27
Second trimester planning
Baby’s organs mature and movement becomes noticeable—stay on track with mid-pregnancy assessments.
- •Schedule the detailed anatomy ultrasound around weeks 18–22
- •Review maternal serum alpha-fetoprotein (MSAFP) or quad screening windows if recommended
- •Plan for the one-hour glucose screening between weeks 24–28
Weeks 28–42
Third trimester preparation
Focus on birth preferences, fetal growth monitoring, and readiness for labor.
- •Discuss Tdap vaccination around weeks 27–36 to protect newborn immunity
- •Arrange group B strep screening between weeks 35–37
- •Review labor signs, kick counts, and induction conversations once you reach 40 weeks
Evidence-based sources
- ACOG Committee Opinion: Methods for Estimating the Due Date
- SMFM Consult Series #60: The Role of Ultrasound in Pregnancy Dating
- CDC: Prenatal Care and Tests
Educational use only. Your healthcare professional will confirm dating and screening schedules.
Trimester timeline at a glance
Track high-priority tasks, body changes, and appointment windows so nothing important slips through the cracks.
First trimester
Hormones surge as the placenta forms—expect fatigue, nausea, and emotional shifts.
Focus areas
Nutrition, hydration, and establishing prenatal care
Recommended check-ins
Initial prenatal visit, baseline labs, early dating ultrasound if needed
Second trimester
Energy often returns while fetal movement increases and the bump becomes visible.
Focus areas
Anatomy scan prep, exercise adjustments, and childbirth education research
Recommended check-ins
Anatomy ultrasound, screening tests, routine prenatal visits every 4 weeks
Third trimester
Baby gains weight rapidly and practice contractions may begin.
Focus areas
Birth plan, hospital bag, and postpartum support
Recommended check-ins
Prenatal visits move to every 2 weeks then weekly, plus growth scans if indicated
Helpful tools to use alongside your due date
Cross-reference your pregnancy timeline with these planners to stay organised before delivery.
Period & Ovulation Calculator
Open tool →Backtrack fertile windows to understand how conception timing influences due date estimates.
Date Add & Subtract Calculator
Open tool →Project induction dates, parental leave start days, or postpartum check-ins in seconds.
Date Difference Calculator
Open tool →Count the days between prenatal appointments or milestones to stay ahead of scheduling.
Not a substitute for medical advice
This calculator is for education and planning. Discuss results with a licensed clinician, and remember we never store or transmit your health data.