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Find Due Date Calculator

This calculator helps you find your estimated due date based on the first day of your last menstrual period (LMP). It also provides key pregnancy milestones, including estimated conception date, fertility window, and the end of the first and second trimesters. A simple and reliable way to track your pregnancy from day one.

Pregnancy Due Date and Milestone Estimator

Input Fields
If enabled, the result will update automatically when you change any value.

Pregnancy Timeline Calculation Formula

Formula
$$\text{Estimated Due Date} = \text{LMP} + 280\ \text{days}$$ $$\text{Estimated Conception Date} = \text{LMP} + (\text{Cycle Length} – 14)$$ $$\text{First Trimester Ends} = \text{LMP} + 84\ \text{days}$$ $$\text{Second Trimester Ends} = \text{LMP} + 189\ \text{days}$$

The fertility window is typically estimated as LMP + (Cycle Length – 19) to LMP + (Cycle Length – 9).

This Find Due Date Calculator is ideal for expecting mothers looking to better understand their pregnancy timeline. By entering the first day of your last menstrual period, the calculator determines:

  • Estimated Fertility Window
  • Estimated Conception Date
  • End of First Trimester (12 weeks)
  • End of Second Trimester (27 weeks)
  • Estimated Due Date (40 weeks)

It helps you track important stages of pregnancy and prepare for prenatal care and delivery planning. This tool is based on standard gestational age calculations used in obstetrics.

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