Simple pregnancy calculators to help you understand your due date, pregnancy week, trimester, and more.
Enter the first day of your last menstrual period (LMP) to view your estimated due date, gestational age, and current trimester.
Webbed fingers and toes begin to separate into distinct digits. The eyelids and external ear folds form, and early involuntary movements begin.
Every tool is designed to provide clear, calm, and accurate gestational information without noise or clutter.
Calculate due date, current weeks & days, trimester, and key milestones in one unified view.
Dedicated clinical calculation based on Naegele's 280-day obstetric formula and ultrasound dating context.
Find out your exact week and day, and forecast how far along you will be on any future date.
Identify your current trimester and map out your personalized 3-trimester calendar timeline.
Follow along from week 4 to 40 with playful fruit and vegetable comparisons and development highlights.
A browsable, week-by-week overview of fetal development milestones throughout all three trimesters.
From blastocyst implantation to full-term preparation, track how your baby transforms and what physiological shifts to anticipate across all three trimesters.
Playful fruit and seed comparisons paired with clear, factual developmental milestones.
The blastocyst completes implantation into the uterine lining. Cells begin early specialization into the embryo, amniotic sac, and placenta.
Webbed fingers and toes begin to separate into distinct digits. The eyelids and external ear folds form, and early involuntary movements begin.
The kidneys begin producing small amounts of urine that pass into the amniotic fluid. This is the optimal window for first-trimester ultrasound dating and nuchal translucency scans.
The eyes make slow, coordinated movements beneath closed eyelids. Some individuals may begin to detect early, subtle flutter-like movements (quickening).
Midpoint of pregnancy (20 completed weeks). Measurement standard changes from Crown-Rump Length to full Head-to-Heel length. Detailed mid-pregnancy anatomy scans typically occur around this week.
Third trimester begins (28 completed weeks). The fetus can blink and turn toward sustained light. Brain tissue expands and develops complex cortical convolutions.
The head may begin descending into the maternal pelvic inlet (lightening or engagement). Most of the lanugo coat has shed into the amniotic fluid.
Reaches the official estimated due date (280 days from LMP). Only a small percentage of births occur on the exact due date; most healthy arrivals occur within two weeks before or after.
Understanding the difference between gestational age and conception age brings clarity to your timeline.
Clinically, pregnancy is measured from the first day of your last menstrual period (LMP), not the date of conception. A standard gestation spans 40 weeks, which equals 280 calendar days.
Because ovulation typically happens about 14 days after your period starts, your baby is conceived about 2 weeks into your counted gestational age. When you are 4 weeks pregnant, your baby has been growing for approximately 2 weeks.
According to ACOG standards, Trimester 1 covers weeks 1â13. Trimester 2 covers weeks 14â27. Trimester 3 starts at week 28 and continues until delivery.
Reliable, evidence-based answers to frequently asked questions about gestational dating and timelines.