Find Your Birth Date by Conception Date

How is the Due Date Calculated?

Typically, pregnancy lasts about 40 weeks (280 days) from the first day of your last menstrual period (LMP). However, knowing your conception date provides a more precise estimate. Counting 266 days from the date of conception gives you a more accurate due date.

Here are the common methods used to estimate your due date:

• Last Menstrual Period (LMP): Count 40 weeks from the first day of your last period. This is the most common method.
• Conception Date: If you know the exact date of conception, add 266 days.
• IVF Transfer Date: For IVF pregnancies, calculating from the transfer date provides a precise due date.
• Early Ultrasound: An early ultrasound can accurately date the pregnancy, especially if your periods are irregular.

Factors Affecting the Accuracy of a Due Date

While calculators and methods provide a good estimate, several factors can affect the accuracy of your due date:

• Irregular Periods: Makes it harder to pinpoint ovulation and conception.
• First Ultrasound Timing: Early ultrasounds are generally more accurate.
• Individual Variation: Every pregnancy is unique, and babies come on their own timeline!

Using the Pregnancy Calculator & Ovulation Estimator

Our Pregnancy Calculator & Ovulation Estimator offers a comprehensive solution for tracking your pregnancy or identifying your most fertile days. You can use our tool to:

• Determine your due date using your last period, conception date, or known due date.
• Pinpoint your fertile window and ovulation day based on your cycle length.
• Utilize the interactive six-month calendar that color-codes your period days, fertile window, and peak ovulation day.

This easy-to-use tool provides personalized timelines and predictions to help you navigate your pregnancy or plan for conception. Our user-friendly interface works seamlessly across all devices.

Trying to conceive? Our tool can help you identify your most fertile days by analyzing your cycle and providing predictions, increasing your chances of conception. Calculate your fertile window with our easy-to-use tools and improve your chances of conceiving!

Already pregnant? You can easily discover when conception most likely occurred given your last menstrual period or early ultrasound results.

Can My Due Date Change?

Yes, it's possible! Your healthcare provider might adjust your due date based on ultrasound measurements, especially during the first trimester. Significant discrepancies between the initial estimate and the ultrasound findings may warrant a change.

Planning Your Conception

While you can't control the exact date of birth, you can certainly influence the conception timeframe. By tracking your ovulation and planning intercourse during your fertile window, you can increase your chances of conceiving within your desired timeframe.

Use our Ovulation Calculator to use the date of your last menstrual period and your typical cycle length to discover the days you're most likely to be fertile and increase your chances of conceiving.

Understanding Gestational Age

Gestational age refers to the age of your pregnancy, typically measured from the first day of your last menstrual period (LMP). Conception, on the other hand, refers to the moment when the sperm fertilizes the egg. Understanding the difference is key to better interpreting pregnancy timelines and information provided by your healthcare provider.

Tools & Resources for Every Stage

Whether you're trying to conceive or are already expecting, having reliable tools and resources at your fingertips can be invaluable. From conception date calculations to pregnancy milestones, understanding your body and your baby's development is now easier than ever.

Track your journey with our comprehensive suite of calculators including:

• Pregnancy Calculator
• Ovulation Calculator