Estimated Due Date Calculator

Calculate your estimated due date (EDD) based on your last menstrual period (LMP) date and average cycle length.

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About This Tool

This EDD from LMP calculator helps pregnant individuals estimate their due date based on the first day of their last menstrual period. Using Naegele's rule (LMP + 280 days), it calculates the estimated delivery date and provides additional information including current gestational age in weeks and days, trimester classification, and a pregnancy timeline. The tool accounts for varying menstrual cycle lengths to provide more accurate results.

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How to Use

Enter the first day of your last menstrual period (LMP) in the date picker.
Optionally adjust your average menstrual cycle length (default is 28 days).
Click the 'Calculate EDD' button to see your estimated due date.
View detailed results including gestational age, trimester, and pregnancy timeline.

Frequently Asked Questions

Find Quick Answers

What is LMP in pregnancy?

LMP stands for Last Menstrual Period, which is the first day of your last period before becoming pregnant. It's commonly used as a reference point for calculating due dates.

How accurate is the EDD calculated from LMP?

The EDD calculated from LMP using Naegele's rule (LMP + 280 days) is a standard medical estimation. However, actual delivery dates can vary by ±2 weeks due to individual differences in cycle length and fetal development.

Should I use my cycle length if it's not 28 days?

Yes, for more accurate results, enter your average menstrual cycle length. The calculator adjusts the due date calculation based on your specific cycle length.

What is gestational age?

Gestational age is the time elapsed since the first day of the last menstrual period, measured in weeks and days. It's different from fetal age, which is calculated from conception.

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