Calculate Your Pregnancy Due Date with Our Free Pregnancy Calculator
Use our pregnancy calculator to estimate your baby's due date and track pregnancy weeks. Simply enter the first day of your last menstrual period (LMP), and our due date calculator will show your expected delivery date and current pregnancy week. You can also explore ovulation and conception calculators for planning.
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How This Pregnancy Week & Due Date Calculator Works
Our pregnancy week calculator adds 280 days (40 weeks) to your LMP to estimate your due date and current pregnancy week. This helps you monitor pregnancy milestones, plan prenatal visits, and understand early pregnancy signs.
Using Our Tool as Ovulation & Conception Calculator
Plan your pregnancy effectively by using our ovulation calculator to find fertile days and our conception calculator to estimate conception dates. Combined with the pregnancy calculator, these tools provide an accurate pregnancy tracker for every stage.
Maternal Health Awareness
Maternal health is crucial for a safe pregnancy. Our calculator is supplemented with evidence-based tips from UNICEF India on antenatal care, nutrition, and safe delivery. Learn about maternal health risks and preventive care to ensure both mother and baby stay healthy.
Why Accurate Due Dates Matter
Knowing your estimated due date helps plan scans, tests, and safe delivery schedules. Our pregnancy calculator gives reliable guidance, but always consult your healthcare provider for precise medical advice.
Pregnancy Weeks & Trimesters
Track your pregnancy weeks and trimester stages:
- First trimester: week 1–12
- Second trimester: week 13–26
- Third trimester: week 27–40
Frequently Asked Questions
How accurate is this pregnancy calculator? It provides an estimate based on Naegele's Rule. Ultrasounds and clinical checks may refine your due date.
Can I estimate my conception date? Yes, using the ovulation calculator or conception calculator along with your pregnancy week calculator, you can approximate your conception window.
What if I don’t remember my LMP? An early ultrasound is the most reliable way to determine gestational age.
Where does the information come from? Trusted sources such as UNICEF India provide evidence-based maternal health guidelines.
References & Trusted Sources
Maternal health context: UNICEF India – Maternal Health.
Pregnancy Dating Methods — Comparison
| Method | How it works & typical accuracy | Pros / Cons |
|---|---|---|
| LMP (Naegele’s Rule) | Add 280 days (40 weeks) to first day of last menstrual period (LMP). Typical accuracy: ±2–3 weeks (less accurate with irregular cycles). | Pros: Simple, quick. Cons: Depends on accurate LMP and regular cycles; less reliable if cycles vary. |
| First-trimester ultrasound | Sonographic crown–rump length measurement dated by trained sonographer (6–13 weeks best window). Typical accuracy: ±5–7 days (most accurate dating method). | Pros: Most accurate for dating; reduces uncertainty. Cons: Requires clinic/scan availability and scheduling. |
| Conception / ovulation–based estimate | Estimate from known ovulation or intercourse dates; useful when conception was planned or tracked. Typical accuracy: ±1–2 weeks depending on ovulation timing accuracy. | Pros: Useful for planned conception (IVF/fertility tracking). Cons: Uncertainty from sperm lifespan and variable ovulation timing. |
When symptoms warrant urgent attention
Severe abdominal pain, heavy bleeding, fainting, or signs of infection need immediate medical evaluation. Our content is informational—always confirm with your clinician.
Why accurate due dates matter (summary)
Knowing your estimated due date helps plan scans, tests, and safe delivery schedules. Our pregnancy calculator gives reliable guidance, but always consult your healthcare provider for precise medical advice.