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Due Date Calculator

Your due date from a period, conception date or scan.

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Your pregnancy timeline

MilestoneWeekDate

Estimated due date

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Where you are now

Gestational age—
Trimester—
Days remaining—
Conception (estimated)—

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Most babies arrive within this window

Fewer than 5 percent of babies are born on their estimated due date, and about 80 percent arrive within two weeks either side. A first-trimester dating scan is more accurate than any date-based calculation. This is a planning date, not a deadline, and not a substitute for antenatal care.

Quick Tool Overview

The Due Date Calculator estimates when a baby is due from whichever information you have — last menstrual period, conception date, IVF transfer or a dating scan. It corrects for cycle length, which standard formulas ignore, and lays out every milestone along the way.

What it does
Estimates a due date and maps the whole pregnancy timeline
You give it
An LMP date, conception date, IVF transfer or scan result
You get back
Due date, current gestational age and trimester dates
Best for
Planning ahead and understanding how dating works
Calculators Free, unlimited use No sign-up Runs in your browser

About the Due Date Calculator

Estimate a due date from whichever information you have: the first day of your last menstrual period, a known conception date, an IVF transfer, or a dating scan. Each method is supported directly rather than making you convert between them first.

The default calculation is Naegele's rule — 280 days from the first day of your last period — adjusted for cycle length, which matters more than most calculators admit. Naegele assumes a 28-day cycle with ovulation on day 14, so a woman with a 35-day cycle is dated a week early unless the tool corrects for it. Fewer than one baby in twenty arrives on the estimated date, and a first-trimester scan is more accurate than any calculation, so treat this as a planning date rather than a deadline.

Key features of the Due Date Calculator

Four dating methods

Last period, conception date, IVF transfer day and scan-based dating are each handled directly rather than converted by hand.

Cycle length correction

Naegele's rule assumes a 28-day cycle, so a 35-day cycle is dated a week early unless corrected — this tool corrects it.

IVF dating done properly

A day-5 transfer is dated 261 days out and a day-3 transfer 263, which is the most precise dating available.

Full milestone timeline

Trimester boundaries, viability, full term and post-term dates, so the due date has context around it.

Honest about accuracy

Fewer than 5 percent of babies arrive on the estimated date, and the page says so.

How to use the Due Date Calculator

  1. 1

    Pick your starting point

    Last menstrual period, conception date, IVF transfer day, or a scan measurement.

  2. 2

    Enter the date

    For the LMP method, use the first day of bleeding rather than the last.

  3. 3

    Adjust your cycle length

    If your cycle is not 28 days, correcting for it can move the due date by a week.

  4. 4

    Read the timeline

    Due date, current gestational age, trimester dates and the milestones along the way.

Frequently asked questions

Naegele's rule adds 280 days — 40 weeks — to the first day of your last menstrual period. Where the conception date is known, the due date is 266 days from conception instead.

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