Pregnancy Week-by-Week Calculator

What is Pregnancy Week-by-Week Calculator?

The Pregnancy Week-by-Week Calculator tracks your pregnancy progress from Week 1 to Week 40. By entering your Last Menstrual Period (LMP) or Estimated Due Date (EDD), it determines your exact current gestational age, trimester progression bar, fetal size fruit comparison, and developmental milestones in real time.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the Pregnancy Week-by-Week Calculator

1. 1
   Choose your input method: "Last Menstrual Period (LMP)" or "Estimated Due Date (EDD)".
2. 2
   Select your date to automatically compute your exact gestational week and day (e.g. Week 24, Day 3).
3. 3
   Review the visual progress bar displaying your current trimester (1st, 2nd, or 3rd) and days remaining until delivery.
4. 4
   Explore the detailed weekly fetal size guide (length, weight, and fruit comparison) and clinical developmental milestones.

Formula & Calculation Logic

Converts elapsed epoch calendar days into standardized obstetric weeks and days, mapping directly to clinical fetal biometry charts (crown-to-rump length CRL, biparietal diameter BPD, and fetal weight estimates).