Measure pregnancy timing from key clinical dates accurately. View progress, due date, and milestones clearly. Built for simple weekly pregnancy tracking.
| Case | Method | Reference Input | Cycle Length | Calculated Gestation | Estimated Due Date |
|---|---|---|---|---|---|
| Example A | LMP | 2026-01-10 | 28 days | Calculated from today | LMP + 280 days |
| Example B | Conception | 2026-02-01 | Not used | Conception + 14 days for gestational age basis | Conception + 266 days |
| Example C | Ultrasound | Scan: 2026-03-01 at 8w 4d | Not used | Back-calculated from scan age | Derived from back-calculated LMP equivalent |
1. LMP method: Gestational age in days = today − LMP date.
2. Standard due date: Estimated due date = LMP + 280 days.
3. Cycle adjustment: Adjusted due date = LMP + 280 days + (cycle length − 28).
4. Conception method: Gestational age basis starts about 14 days before conception, so LMP equivalent = conception date − 14 days.
5. Conception due date: Estimated due date = conception date + 266 days.
6. Ultrasound method: LMP equivalent = ultrasound date − gestational age measured on scan.
7. Progress percentage: Pregnancy progress = (gestational days ÷ 280) × 100.
8. Weeks and days format: Weeks = floor(total gestational days ÷ 7), days = total gestational days mod 7.
Current gestation is the pregnancy age counted in weeks and days. It usually starts from the first day of the last menstrual period, not from conception itself.
Gestational age usually includes about two weeks before fertilization. Fetal age estimates actual time since conception, so it is commonly around 14 days less.
LMP is common when cycle timing is reliable. Early ultrasound may be more accurate if periods are irregular or the LMP date is uncertain.
Yes. Longer or shorter cycles can shift ovulation timing. Adjusting the due date by the cycle difference improves estimates when the LMP method is used.
No. The due date is an estimate based on standard pregnancy timing. Birth can naturally happen before or after that date.
Yes. Enter the scan date and the gestational age measured on that scan. The calculator back-calculates the pregnancy start point and estimated due date.
Trimester grouping helps you understand the pregnancy stage quickly. It is useful for milestones, checkups, and general planning across the full term.
No. It is an educational estimate tool. Clinical decisions should always follow guidance from a qualified obstetric or prenatal care professional.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.