Calculator Suite
Pregnancy Weeks Calculator
Calculate gestational age, due date, and track fetal development milestones
Common Scenarios
Key Milestones
Medical Disclaimer
This calculator provides estimates based on standard pregnancy calculations. Always consult with your healthcare provider for personalized medical advice, accurate dating via ultrasound, and pregnancy monitoring.
Due Date (Naegele's Rule)
= Estimated Due Date
= Last Menstrual Period
Standard 40-week pregnancy
Gestational Age
= Gestational Age in weeks
Conception Date
Assumes 28-day cycle with day 14 ovulation
Welcome to your central hub for one of life’s most exciting calculations. If you're asking, “how far along am i in my pregnancy” or “when will my baby be born”, you've come to the right place. Our free and accurate pregnancy calculator is here to provide clarity and confidence as you begin this incredible journey. Our pregnancy week calculator helps you determine exactly how far along you are in your pregnancy and when your baby is due to arrive. This tool is designed to help you calculate my due date pregnancy based on several methods, from your last menstrual period (LMP) to your conception date, giving you a personalized timeline for the months ahead.
Due Date & Pregnancy Calculator
Understanding your timeline is the first step toward planning your pregnancy journey. Our versatile calculator is designed to give you a clear estimated delivery date (EDD). You can use it as a pregnancy calculator based on last period, a pregnancy calculator conception date tool, or even use your IVF transfer date.
Simply enter the relevant date, and the calculator will instantly generate your estimated due date, tell you what week of pregnancy am i in, and map out your key pregnancy milestones. This information is crucial for scheduling your first prenatal care appointment and tracking your progress.
How to Calculate Pregnancy Weeks: Understanding Your Results
Once you have your due date, you'll want to know how to calculate pregnancy weeks. This is measured as your gestational age, a critical metric for monitoring your health and your baby's growth.
Pregnancy is typically calculated as 40 weeks (280 days) from the first day of your last menstrual period. This method is standard among healthcare providers. Even though conception likely happened about two weeks after your LMP (around ovulation), the first day of your period marks week one. This is because it’s a more certain date for most people. Our pregnancy calculator using LMP uses this standard method, often based on a principle called Naegele's Rule. Your pregnancy will be divided into three main stages, or trimester periods, each with unique phases of fetal development.
Methods for Calculating Your Due Date
Navigating your pregnancy timeline means understanding how your due date is determined. Here are the fundamental concepts our calculator uses.
Last Menstrual Period (LMP)
This is the most common method. By using the first day of your last menstrual period (LMP), the calculator adds 280 days (40 weeks) to estimate your delivery date. It's a reliable starting point for those with regular cycles.
Conception Date
If you were tracking ovulation and know the exact or approximate conception date, you can use this for a more precise calculation. This answers the question, “when did i conceive”? and is especially helpful for those with irregular cycles.
Ultrasound Dating
While our calculator provides an excellent estimate, the most accurate method is an early pregnancy ultrasound. During this scan, a healthcare provider will measure the crown-rump length (CRL) of the fetus to precisely determine the gestational age. This ultrasound dating is often used to confirm or adjust the EDD calculated by your LMP.
Your Pregnancy Journey: What to Expect
An estimated due date is more than just a date; it's the start of a countdown to meeting your baby. It’s important to remember that only about 5% of babies are born on their exact due date, with most arriving between 37-42 weeks.
As you progress, you'll experience a range of pregnancy symptoms and exciting pregnancy milestones. Early signs can include fatigue, nausea, and tender breasts. Gestational age is measured in weeks and helps healthcare providers monitor your baby's development, ensuring everything is on track. Regular prenatal care is essential for a healthy pregnancy for both you and your baby.
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Frequently Asked Questions (FAQ)
How many weeks pregnant am I?
To figure this out, you need to know how to count pregnancy weeks. Start with the first day of your last menstrual period (LMP). Count the total number of weeks from that date to today's date. For example, if your LMP was 8 weeks ago, you are in your 8th week of pregnancy. Our calculator does this for you automatically, providing an exact answer to “how far along am i in my pregnancy”.
When do pregnancy symptoms start?
Early pregnancy symptoms can begin as soon as one to two weeks after conception, often before you've even missed a period. Common early signs include fatigue, breast tenderness, frequent urination, mild cramping, and nausea (morning sickness), though every pregnancy is different.
What if I don't remember my last period?
If you can't recall your LMP, you have a few options. You can try to estimate it as best as possible. If you know your conception date, you can use that in our calculator. Otherwise, the most reliable method will be to schedule an appointment with your doctor for ultrasound dating to accurately determine your gestational age.
How accurate is a pregnancy calculator?
A pregnancy calculator is very accurate at estimating your due date based on the information you provide. If you have a regular 28-day cycle, the LMP method is a strong predictor. However, its accuracy depends on the regularity of your menstrual cycle and the correctness of your dates. The gold standard for accuracy remains an early-trimester ultrasound, which can confirm or refine the date.
Can I use this calculator with irregular periods?
Yes, but with a caveat. If your periods are irregular, using the LMP method may result in an inaccurate due date because your ovulation date can vary significantly. In this case, using the conception date option in our calculator (if you know it) will provide a much better estimate. Otherwise, ultrasound dating will be the most reliable way to establish your estimated delivery date (EDD).