What is this Tool?
The Pregnancy Due Date Calculator estimates your baby's expected arrival date based on the first day of your last menstrual period (LMP) and your average cycle length. Pregnancy is typically 40 weeks (280 days) from the first day of your LMP. This calculator uses Naegele's rule — the standard medical method used by obstetricians worldwide — adjusted for your specific cycle length.
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Frequently Asked Questions
How do I calculate my pregnancy due date week by week and days?
Enter the first day of your last menstrual period (LMP) in the calculator above. It instantly shows your estimated due date, how many weeks and days pregnant you are right now, your current trimester, and days remaining. Pregnancy is calculated as 40 weeks (280 days) from the first day of your LMP using Naegele's Rule.
If I am 5 weeks 5 days pregnant, when is my due date?
If you are 5 weeks and 5 days pregnant today, your LMP was approximately 40 days ago. Enter that date in the calculator above to get your exact estimated due date. At 5 weeks 5 days, your due date is approximately 34 weeks and 2 days away. Use the calculator for your precise date based on your actual LMP.
How do I calculate how many weeks pregnant I am?
Pregnancy weeks are counted from the first day of your last menstrual period (LMP), not from conception. The formula is: Weeks Pregnant = (Today's Date − LMP Date) ÷ 7. This calculator does this automatically — just enter your LMP date and it shows your exact weeks and days pregnant instantly.
If I am 6 weeks pregnant, what is my due date?
If you are 6 weeks pregnant, your LMP was 42 days ago. Your estimated due date is 34 weeks from today (approximately 238 days away). Enter your exact LMP date in the calculator above for a precise due date — results show date, trimester, weeks pregnant and days remaining all at once.
What is 7 weeks 3 days pregnant in due date?
At 7 weeks and 3 days pregnant, your LMP was 52 days ago. Your estimated due date is approximately 32 weeks and 4 days from today. The first trimester lasts until week 13 — so at 7 weeks 3 days, you are in your first trimester with approximately 228 days until your due date. Enter your LMP date above for your exact result.
How accurate is this pregnancy due date calculator?
This calculator is accurate to within 1–2 weeks for most pregnancies with regular 28-day cycles. The accuracy improves when you enter your actual cycle length if it differs from 28 days. Only 5% of babies are born exactly on their EDD — most arrive within 2 weeks on either side. An ultrasound between weeks 8–12 is the most accurate way to confirm your due date.
What are the pregnancy dates for each trimester?
First trimester: Weeks 1–13 (months 1–3). Second trimester: Weeks 14–27 (months 4–6). Third trimester: Weeks 28–40+ (months 7–9). Most pregnancy symptoms like morning sickness occur in the first trimester. The second trimester is often the most comfortable. The third trimester prepares for birth.
What if my cycle is not 28 days?
This calculator adjusts for cycle lengths other than 28 days. Enter your actual average cycle length — if your cycle is longer (e.g. 35 days), ovulation happens later, pushing the due date forward. If shorter (e.g. 24 days), your due date will be earlier. Most cycles range from 21–35 days.
How do I calculate due date by LMP (week by LMP)?
LMP stands for Last Menstrual Period. To calculate your due date by LMP: add 280 days (40 weeks) to the first day of your last period. This is Naegele's Rule — the standard used by doctors worldwide. Enter your LMP date in the calculator above and your due date, current week and days pregnant are calculated instantly.
What does "weeks pregnant by LMP" mean?
Weeks pregnant by LMP means counting pregnancy from the first day of your Last Menstrual Period — not from conception. Since most people don't know their exact conception date, LMP is the standard starting point. At the time of conception (around week 2), you are already counted as 2 weeks pregnant by LMP.
What is the American Pregnancy Association due date calculator?
The American Pregnancy Association (APA) uses the same standard LMP-based formula to calculate due dates — adding 280 days to the first day of your last menstrual period. This free due date calculator uses the same formula and gives identical results. Enter your LMP date above for an instant APA-equivalent due date calculation.
How far along am I at 13 weeks or 22 weeks?
Enter the first day of your last period above to see your exact weeks and days. At 13 weeks you are at the end of the first trimester, with about 27 weeks to go. At 22 weeks you are in the second trimester, with about 18 weeks until your due date.
When should I see a doctor after a positive pregnancy test?
Schedule your first prenatal appointment as soon as you confirm pregnancy — ideally by week 8. Early prenatal care is essential for monitoring fetal development, confirming the due date via ultrasound, and identifying any complications early. An ultrasound between weeks 8–12 gives the most accurate due date.
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