Find Your Baby’s Due Date.

Pregnancy Due Date Calculator: Predict Your Baby’s Birth Date

Our Pregnancy Due Date Calculator helps expecting mothers predict their baby’s arrival using the same medical formula (Naegele’s Rule) that doctors use. Simply provide the first day of your last menstrual period and your average cycle length to get:
✅ Personalized Due Date
✅ Current Pregnancy Week & Trimester
✅ Conception Date Estimate
✅ Visual Pregnancy Progress Tracker
Perfect for planning prenatal care, maternity leave, and baby preparations!

Pregnancy Due Date Calculator

Every pregnancy journey begins with one exciting question: “When will my baby be born?” Our Pregnancy Due Date Calculator gives you the most accurate estimate possible, using medically approved calculations tailored to your unique cycle. Whether you’re planning maternity leave, preparing the nursery, or simply curious, this tool helps you track your pregnancy week-by-week with confidence.

Pregnancy Due Date Calculator

Supports LMP, Conception date or IVF transfer



What is a Pregnancy Due Date Calculator?

A due date calculator estimates your baby’s arrival date based on:

  • First Day of Last Menstrual Period (LMP)
  • Average Cycle Length (typically 28 days, adjustable for irregular cycles)

This follows the Naegele’s Rule, the standard method used by obstetricians worldwide:
🔹 Due Date = LMP + 280 days (40 weeks)

Why It Matters

  • Helps schedule prenatal visits and ultrasounds
  • Tracks fetal development milestones
  • Prepares you mentally and physically for delivery

How to Use Our Calculator (Step-by-Step)

Follow these easy steps to estimate your due date quickly and accurately

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Step 1: Choose a Method

Select from LMP + Cycle, Conception Date, or IVF Transfer depending on your situation.

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Step 2: Enter Your Date

Input the relevant date (LMP, conception, or IVF transfer) into the form.

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Step 3: Add Cycle Info

If using LMP, enter your average cycle length for best accuracy.

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Step 4: Click Calculate

Click the calculate button to see your estimated due date and gestational age.

Enter Your Last Period Date

📅 Select the first day of your most recent menstrual cycle.
Example: If your period started June 1, select “June 1, 2024.”

Adjust Your Cycle Length (Optional)

🔄 Default is 28 days, but you can customize:

  • Short cycles (21-27 days): Conception likely occurred earlier
  • Long cycles (35-45 days): Ovulation happened later

Click “Calculate”

💡 Instantly get:
✅ Estimated Due Date
✅ Current Pregnancy Week (+ days)
✅ Trimester Timeline
✅ Progress Percentage

What Your Results Mean

ResultWhat It Tells YouWhy It’s Important
Due DateLikely delivery window (37-42 weeks)Helps plan maternity leave, baby showers, and medical care
Conception DateWhen fertilization probably occurredUseful for genetic testing timelines
Current WeekExact gestational age (e.g., “Week 12 + 3 days”)Tracks fetal growth against averages
TrimesterPhase of pregnancy (1st/2nd/3rd)Alerts you to phase-specific symptoms and checkups

Understanding Variability

  • Only 5% of women deliver on their exact due date
  • Normal range: 2 weeks before or after the estimated date
  • First-trimester ultrasounds provide the most accurate dating

Special Features of Our Calculator

Cycle-Length Adjustment

🔹 More accurate than standard calculators by accounting for irregular periods.
🔹 How it works:

  • Short cycles → Earlier ovulation → Adjusted due date
  • Long cycles → Later ovulation → Extended due date

Interactive Pregnancy Timeline

📅 Visual breakdown of your 40-week journey:

  • First Trimester (Weeks 1-13): Organ development
  • Second Trimester (Weeks 14-27): Movement and growth
  • Third Trimester (Weeks 28-40): Final preparations

Progress Tracker

📊 Color-coded bar showing:

  • % of pregnancy completed
  • Weeks remaining

When to See a Doctor

While our tool is helpful, always consult your OB-GYN for:
⚠ No period but negative pregnancy test
⚠ Irregular cycles (>45 days apart)
⚠ Discrepancies between LMP and ultrasound dates

Frequently Asked Questions

Q: Can I use this for IVF pregnancies?

A: Yes! Input your embryo transfer date and subtract:

  • Day 3 embryo: Subtract 263 days
  • Day 5 embryo: Subtract 261 days

Q: What if I don’t remember my LMP?

A: Try these alternatives:

  1. Use the date of your first positive pregnancy test (typically 4-5 weeks pregnant)
  2. Request a dating ultrasound (most accurate before 13 weeks)

Q: Why is my due date different from my doctor’s estimate?

A: Clinicians may adjust based on:

  • Early ultrasound measurements
  • Fundal height checks
  • Irregular cycle history