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Pregnancy Due Date & Trimester Calculator

Calculate estimated delivery date and milestones using Naegele’s rule.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Calculates expected delivery based on Naegele’s rule (280 days from LMP, adjusted for non-28 day menstrual cycles).

How to use it (step by step)

  1. 1Fill in the boxes: “First day of last menstrual period”, “Average cycle length (days)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Grace period
The days between your statement and the due date. Pay the full statement amount by then and you pay no interest.
Average (mean) / median
Average = add everything and divide by how many. Median = the middle value when sorted; it is not pulled by extreme values.

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