Calculate your due date, current pregnancy week, baby development milestones, and key medical appointment dates — free and instant.
Enter your details below for a complete pregnancy timeline, baby development guide, and personalised health tips.
📌 Most accurate method. Due date = LMP + 280 days (Naegele's Rule). Cycle length adjustment applied automatically.
Our Pregnancy Calculator is the most complete free tool to track your pregnancy journey. Calculate your due date, find out your current pregnancy week, explore your baby's development week by week, and get all your key medical appointment dates in one place — instantly and free.
Supports 4 calculation methods: Last Menstrual Period (LMP), Conception Date, Known Due Date from doctor/ultrasound, and IVF Transfer Date.
Your complete pregnancy report appears instantly including due date, countdown, current week, trimester, baby size, key dates timeline, and personalised health tips.
| Week | Milestone |
|---|---|
| Week 4 | Positive pregnancy test, missed period |
| Week 6 | Heartbeat detectable on transvaginal ultrasound |
| Week 8 | First prenatal appointment with OB/GYN |
| Week 10–11 | NIPT genetic blood test, Nuchal Translucency (NT) scan |
| Week 12 | End of first trimester — risk drops significantly |
| Week 16–20 | You may feel baby movements (quickening) for the first time |
| Week 18–22 | Anatomy scan — checks all organs, can reveal gender |
| Week 20 | Halfway point! 50% complete |
| Week 24 | Glucose challenge test (GCT) for gestational diabetes; viability milestone |
| Week 27 | Third trimester begins |
| Week 28 | Anti-D injection (if Rh-negative), Tdap vaccine |
| Week 35–36 | Group B Strep test; pack hospital bag |
| Week 36+ | Weekly OB appointments begin |
| Week 37 | Early term — baby is nearly ready |
| Week 39–40 | Full term — due date window |
The most common method is Naegele's Rule: add 280 days (40 weeks) to the first day of your Last Menstrual Period (LMP). This assumes a 28-day cycle. If your cycle is longer or shorter, the tool adjusts automatically. Only about 5% of babies are born exactly on their due date — the normal range is 37–42 weeks.
This tool uses the same formulas used by medical professionals. However, an ultrasound scan (especially in the first trimester) gives a more accurate due date by measuring the baby directly. Always confirm dates with your healthcare provider.
Gestational age (used by doctors) counts from the first day of your LMP — so you are considered 2 weeks pregnant at conception. Fetal age counts from the actual date of conception and is 2 weeks less. This calculator uses gestational age, which is the standard medical convention.
Yes, completely free with no login, no account, and no limits.
Use the Weekly Development Browser in the results to click any week and see exactly what your baby looks like, what organs are developing, and how big they are at any point in the pregnancy.
