How to Calculate Your Pregnancy Due Date: Step-by-Step Guide

Learn how to calculate your pregnancy due date using simple methods like LMP and the Naegele's rule formula. Get your estimated delivery date easily.

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To calculate your due date, add 280 days (40 weeks) to the first day of your last menstrual period (LMP). Alternatively, use the formula: First day of LMP + 1 year - 3 months + 7 days. This provides an estimated delivery date.

FAQs & Answers

  1. What is the most accurate way to calculate my due date? The most common method to estimate your due date is by adding 280 days (or 40 weeks) to the first day of your last menstrual period (LMP). Ultrasound measurements can also improve accuracy.
  2. What is Naegele's rule for calculating due dates? Naegele's rule estimates your due date by taking the first day of your last menstrual period, adding one year, subtracting three months, then adding seven days.
  3. Can the due date change during pregnancy? Yes, due dates can be adjusted based on ultrasound findings or other clinical assessments, especially if the menstrual cycle is irregular.

Watch More

For more detailed information on pregnancy and prenatal care, explore our guides on pregnancy stages, signs of labor, and tips for a healthy pregnancy to stay informed throughout your journey.

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  3. How to Determine What Week You Are Pregnant: Easy Calculation Guide Learn how to calculate your pregnancy week using the first day of your last menstrual period and get accurate tracking tips.
  4. How Accurate Are Due Dates in Pregnancy? Discover the accuracy of due dates and what factors influence them during pregnancy.