👶 Pregnancy Due Date
Pregnancy Due Date Calculator
🧮 Calculate Your Due Date
Estimated Due Date
—
Current Week–
Trimester–
Days Remaining–
Enter your LMP date above.
👶 How is Due Date Calculated?
Using Naegele’s Rule, due date = First day of last menstrual period + 280 days (40 weeks). This assumes a standard 28-day menstrual cycle.
Trimester Breakdown
| Trimester | Weeks |
|---|---|
| First | 1-12 |
| Second | 13-26 |
| Third | 27-40 |
⚠ This calculator provides estimates only. Consult your doctor for accurate medical dating via ultrasound.
👶 Key Pregnancy Milestones by Week
| Week Range | Milestone |
|---|---|
| Week 4-5 | Missed period, early pregnancy tests may detect |
| Week 6-8 | Heartbeat often detectable via ultrasound |
| Week 11-13 | First trimester screening, NT scan |
| Week 18-22 | Anatomy scan, gender often determinable |
| Week 24 | Viability milestone (with intensive care if born) |
| Week 28 | Third trimester begins, glucose screening |
| Week 37 | “Early term” – baby considered developed enough |
| Week 40 | Full-term due date |
📋 Other Methods to Estimate Due Date
| Method | Accuracy | When Used |
|---|---|---|
| LMP-based (this calculator) | Good if cycle is regular 28 days | Standard first estimate |
| Ultrasound dating (1st trimester) | Most accurate (±5-7 days) | Confirms/adjusts LMP estimate |
| Conception date-based | Good if conception date known | IVF/fertility treatment pregnancies |
| Fundal height measurement | Less precise, used as check | Later pregnancy monitoring |
⚠ Medical Disclaimer: This calculator provides estimates for informational purposes only. Always follow your healthcare provider’s dating and monitoring throughout pregnancy for medical accuracy.
Related Calculators
👶 Common Symptoms by Trimester
| Trimester | Common Symptoms |
|---|---|
| First (Weeks 1-12) | Nausea, fatigue, breast tenderness, frequent urination |
| Second (Weeks 13-26) | Energy increase, visible bump, baby movement felt (~18-20wk) |
| Third (Weeks 27-40) | Back pain, difficulty sleeping, Braxton Hicks contractions |
💡 General Pregnancy Wellness Considerations
- Prenatal vitamins: Folic acid is particularly important, ideally started before conception
- Regular prenatal checkups: Follow your healthcare provider’s recommended visit schedule
- Avoid alcohol and smoking: No safe level established during pregnancy
- Stay hydrated: Increased fluid needs during pregnancy
- Moderate exercise: Generally beneficial unless advised otherwise by your doctor
⚠ This is general informational content only. Always consult your obstetrician or healthcare provider for personalized medical guidance throughout pregnancy.
❓ Frequently Asked Questions
How is the pregnancy due date calculated? +
Due date is calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP), using Naegele’s Rule. This is an estimate – only about 5% of babies are born on their exact due date.
What are the three trimesters of pregnancy? +
First trimester: weeks 1-12. Second trimester: weeks 13-26. Third trimester: weeks 27-40 (until birth). Each trimester has distinct developmental milestones for the baby.
Is the due date calculator accurate? +
This calculator provides a standard estimate based on a 28-day cycle assumption. Actual due dates can vary based on individual cycle length and ovulation timing. Always confirm with your doctor via ultrasound dating for accuracy.
How many weeks is a full-term pregnancy? +
A full-term pregnancy is considered 39-40 weeks. Babies born 37-38 weeks are ‘early term’, before 37 weeks is ‘preterm’, and after 42 weeks is ‘post-term’.