Due Date Calculator

Q: How accurate is the due date?

A due date is an estimate , not a guarantee. Only about 5% of babies are born exactly on their due date , but it's a helpful guide for planning.

Use the free Due Date Calculator by Calculator Hub HQ to estimate your baby’s expected delivery date. Enter the first day of your last menstrual period (LMP) or conception date to instantly find out when your baby is likely to arrive. Fast, accurate, and pregnancy-safe.

What is a Due Date Calculator?

A Due Date Calculator is a pregnancy tool that helps you estimate your baby’s expected delivery date based on your last menstrual period (LMP) or date of conception. Pregnancy typically lasts about 280 days (40 weeks) from the start of your last period, and this calculator uses that standard to provide an accurate estimation.

At Calculator Hub HQ, our Due Date Calculator is designed for:

Expecting parents tracking their pregnancy
Women planning prenatal visits and checkups
Healthcare providers assisting with patient timelines
Anyone curious about the pregnancy timeline

Why Use Calculator Hub HQ’s Due Date Calculator?

Accurate & Instant Results – Based on medical pregnancy formulas
Supports LMP or Conception Date – Choose your preferred method
Free, Private & Easy to Use – No sign-up or data sharing required
Includes Pregnancy Milestones – Optional trimester and week-by-week details
Mobile-Friendly – Use on your phone, tablet, or desktop

This tool provides a quick snapshot of your estimated due date so you can start planning with confidence.

How the Calculator Works

Our Due Date Calculator uses one of the following:

LMP (Last Menstrual Period) – Most commonly used by doctors
Date of Conception or Ovulation – For those tracking cycles or using IVF

The standard pregnancy length is calculated from the first day of your last period, not the date of conception, making this method widely accepted for estimating due dates.

What You Can Learn:

Using our Due Date Calculator, you can discover:

Your estimated due date
How far along you are in your pregnancy
Your trimester status
Key pregnancy milestones
Projected fertility and ovulation windows (if planning)

Example Calculation:

If your LMP was July 1, your estimated due date will be April 7 of the following year. The calculator adds 280 days to provide this estimate.

Frequently Asked Questions

How accurate is the due date?

A due date is an estimate, not a guarantee. Only about 5% of babies are born exactly on their due date, but it’s a helpful guide for planning.

Can I use this calculator if I had IVF?

Yes, enter your conception date or embryo transfer date for an accurate estimate.

Does the calculator adjust for irregular cycles?

This version uses a 28-day cycle assumption. For irregular cycles, conception-based input is more accurate.

Plan Your Pregnancy with Confidence

Knowing your due date helps you schedule doctor visits, prepare for your baby, and track your pregnancy week by week. The Due Date Calculator by Calculator Hub HQ is a simple and trustworthy way to stay informed every step of the way.

Calculate your due date now—fast, accurate, and 100% free.