Pregnancy Due Date Calculator

Pregnancy Due Date Calculator

Pregnancy Due Date Calculator

🍼 What Is a Pregnancy Due Date Calculator?

A Pregnancy Due Date Calculator helps expectant mothers estimate their baby’s arrival date. It typically uses Naegele’s rule — adding 280 days (40 weeks) to the first day of the last menstrual period (LMP) — to predict the Estimated Due Date (EDD) unidocs.co.uk+14perinatology.com+14americanpregnancy.org+14mylittlelightmidwifery.com+3en.wikipedia.org+3stanfordchildrens.org+3.

Pregnancy Due Date Calculator

🧠 How It Works

  1. Enter the first day of your last period (LMP).
  2. Optionally adjust your cycle length if it’s not 28 days.
  3. The tool calculates your EDD automatically.

Clinically, if conception date is known (e.g., IVF), add 266 days instead; early ultrasound (10–14 weeks) may refine the date somersetft.nhs.uk+2nhs.uk+2111.wales.nhs.uk+2stanfordchildrens.org+2americanpregnancy.org+2nhs.uk+2perinatology.com+1verywellfamily.com+1.

📊 Example Dates

InputValue
LMPApril 1, 2025
Cycle Length28 days
Estimated Due DateJanuary 6, 2026
Pregnancy Span40 weeks

📈 Pregnancy Timeline

mermaidCopyEditline
  title Pregnancy Timeline (40 Weeks After LMP)
  x-axis Weeks
  y-axis Milestone
  0 : LMP
  12 : First Trimester Ends
  20 : Mid-Pregnancy (Anomaly Scan)
  28 : Third Trimester Begins
  40 : Estimated Due Date (EDD)

This visual helps users track key stages like the anatomy scan or trimester transitions.

✅ Why Use This Calculator?

  • 🎯 Track gestational age accurately
  • 📅 Plan prenatal appointments and scans
  • 👶 Prepare for labor and childbirth
  • 🕒 Adjust expectations with cycle length variations
  • 🔒 Completely private, free, and mobile-friendly

Note: Only ~4–5% of babies are born exactly on their due date; most arrive between 37–42 weeks uptodate.com+7verywellhealth.com+7en. Wikipedia.org+7.

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✅ Important Notes