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Due date & trimester

Pregnancy Due Date

Pregnancy Due Date Calculator - free online pregnancy due date calculator tool with instant results. Use it for body metrics, wellness estimates,

No data stored Instant results Mobile-first 100% Free

Includes

Timeline insight

  • EDD & gestational age
  • Trimester band

Start date

Use the first day of last period (LMP) or a known conception estimate.

Guide, FAQs & related tools

What Is a Pregnancy Due Date Calculator?

A due date calculator applies Naegele’s rule (due date ≈ first day of LMP + 280 days) or adds 266 days from an estimated conception date. We show approximate gestational age from LMP, current trimester, and days until due date.

Quick planning and understanding of pregnancy timelines; ultrasound dating by a clinician remains the gold standard for individual care.

How to Use the Pregnancy Due Date Calculator - Step by Step

  1. 1

    Choose starting point

    LMP (first day of last period) or known/estimated conception.

  2. 2

    Enter the date

    Use the calendar picker (YYYY-MM-DD).

  3. 3

    Calculate

    Review due date, trimester band and gestational weeks from today.

Frequently Asked Questions - Pregnancy Due Date Calculator

Guide & insights

Pregnancy Due Date Calculator — complete guide

Clear explanations, practical tips and how this free pregnancy due date calculator fits real workflows — optimized for reading on any device.

What is the Pregnancy Due Date Calculator?

A due date calculator applies Naegele’s rule (due date ≈ first day of LMP + 280 days) or adds 266 days from an estimated conception date. We show approximate gestational age from LMP, current trimester, and days until due date.

Why people use this calculator

Quick planning and understanding of pregnancy timelines; ultrasound dating by a clinician remains the gold standard for individual care.

How to use the Pregnancy Due Date Calculator — summary

  • Choose starting point: LMP (first day of last period) or known/estimated conception.
  • Enter the date: Use the calendar picker (YYYY-MM-DD).
  • Calculate: Review due date, trimester band and gestational weeks from today.

Tips for best results

Use these numbers as conversation starters with a qualified professional — not as a diagnosis. Track trends over weeks, not single days.