Pregnancy Due Date Calculator 2026 – Accurate EDD & Tracker

Free online due date calculator: Estimate delivery date, track pregnancy weeks/days, and monitor progress with visual timeline. Medical-grade calculations based on LMP or IVF transfer dates.

Trusted Due Date Estimation

This calculator uses Naegele's Rule, the standard method recommended by the American College of Obstetricians and Gynecologists (ACOG). It adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). While every pregnancy is unique, this provides a reliable estimate for planning.

QuickDuck Tools – Educational reference. Always consult your healthcare provider for medical advice.

Pregnancy Due Date Calculator

How Due Dates Are Calculated (Naegele's Rule)

The medical standard for estimating due dates is Naegele's Rule, which assumes a 28‑day menstrual cycle with ovulation on day 14.

  1. Identify the first day of your last menstrual period (LMP).
  2. Add 280 days (40 weeks) to that date.
  3. Alternative formula: LMP + 9 months + 7 days.
📌 Example: LMP = January 1, 2026 → Estimated Due Date = October 8, 2026.

Note: Only about 5% of babies arrive exactly on their due date. This is an estimate for planning purposes.

Pregnancy Due Date Calculator Chart

How Accurate Is the Due Date Calculator?

This calculator uses the same Naegele's Rule that obstetricians and midwives rely on for initial dating. However, it's important to understand the limitations:

  • Cycle Variation: If your cycles are longer or shorter than 28 days, your actual ovulation date may differ.
  • Ultrasound Confirmation: First‑trimester ultrasound is the gold standard for dating and may adjust your EDD.
  • Individual Factors: Only 4–5% of women deliver on their exact due date; most deliver within two weeks before or after.

QuickDuck provides this tool as an educational reference. Always discuss your estimated due date with your healthcare provider.

Welcome to Your Pregnancy Journey
Our medically-accurate due date calculator helps you:
✅ Instantly calculate EDD based on LMP
✅ Track pregnancy progress in weeks+days
✅ Visualize progress with dynamic timeline
✅ Get daily updated countdown

✨ Key Features:

  • OB-GYN Approved: Uses Naegele's rule (280-day standard)
  • Dual Dating: Supports LMP and IVF transfer dates
  • Progress Analytics: Percentage completion + visual bar
  • Multi-Device: Perfect for mobile & desktop use
  • Zero Storage: No data collection or registration

Perfect For:

  • Expecting mothers
  • Fertility patients
  • Obstetric professionals
  • Birth preparation classes

How It Works:

  1. Select LMP date
  2. Click Calculate
  3. Get instant pregnancy timeline

Frequently Asked Questions

Q: How accurate is the due date from LMP?

A: The LMP method provides a reasonable estimate, but only about 5% of babies arrive on the exact due date. Ultrasound dating in the first trimester is more precise.

Q: Can I use this calculator if I conceived via IVF?

A: Yes, but the calculation differs. For IVF, use the embryo transfer date and add 266 days (or 261 days for day‑3 transfer). Our tool currently uses LMP; consult your fertility clinic for precise dating.

Q: What if my cycle is irregular?

A: Naegele's Rule assumes a 28‑day cycle. With irregular cycles, the due date may be less accurate. An early ultrasound is recommended for better dating.

Q: Why does pregnancy count from LMP and not conception?

A: Because the exact date of conception is rarely known, while LMP is an objective date. Gestational age is measured from LMP, adding two weeks before conception.

Q: Is this calculator a substitute for medical advice?

A: No. This tool is for educational purposes only. Always rely on your healthcare provider for medical decisions and official due date confirmation.