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40 weeks

Pregnancy Due Date Calculator

100% Free

Estimate your due date, current week, trimester, and key pregnancy milestones from your last period or conception date — instantly and in-browser. Informational only, not medical advice.

EDD + Milestones
Week & Trimester
Days To Go
100% Client-Side

1. Your dates

Calculate by

Informational only — not medical advice. This is a calendar estimate, not a diagnosis. Only your doctor or an ultrasound can confirm a due date. Always follow professional antenatal care.

2. Estimate

Estimated due date
16 February 2026
You are
64w 2d
Trimester
3
Days to go
-170
Progress100%
Milestones
Estimated conception
26 May 2025
End of first trimester
11 August 2025
Anatomy scan window (~20 weeks)
29 September 2025
End of second trimester
17 November 2025
Full term begins (37 weeks)
26 January 2026
Estimated due date (40 weeks)
16 February 2026

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<iframe
  src="https://tools.town/embed/pregnancy-due-date/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Pregnancy Due Date Calculator">
</iframe>

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How to Use

  1. 1 Choose to calculate by last period or conception date
  2. 2 Enter the date
  3. 3 Adjust your average cycle length if it isn't 28 days
  4. 4 See your estimated due date instantly
  5. 5 Review your current week, trimester, and milestones

Features

  • Due date by LMP (Naegele's rule) or conception date
  • Cycle-length adjustment for non-28-day cycles
  • Current gestational age in weeks and days
  • Trimester and days-remaining at a glance
  • Milestone timeline through full term
  • 100% in-browser — your dates never leave your device

Why it Matters

Knowing your estimated due date anchors everything else — appointments, scans, leave planning, and simply counting down. A quick, private estimate from your last period gives you that anchor in seconds, while a clear milestone timeline shows what's coming next.

★★★★★

Use Cases

Expecting Parents

Get an estimated due date and countdown

Planning Ahead

Line up scans, appointments, and leave

Understanding Trimesters

See which trimester you're in and what's next

Sharing News

Have a clear date to share with family

What this tool does

The Pregnancy Due Date Calculator estimates your expected delivery date (EDD), your current week and trimester, days remaining, and the key milestones of pregnancy — from either the first day of your last period or a known conception date.

How it works

By default it uses Naegele’s rule: the due date is 280 days (40 weeks) from the first day of your last menstrual period. If your cycle isn’t 28 days, the tool shifts the estimate to match when you actually ovulate. Choose the conception-date method and it counts 266 days from conception instead.

Informational only — not medical advice

This is a calendar estimate, not a diagnosis. Babies rarely arrive exactly on the estimated date, and an early ultrasound is the most accurate way to date a pregnancy. Always confirm your due date and discuss any concerns with your doctor or midwife. To understand the dating methods in depth, see our due date guide.

Privacy

Everything runs in your browser. The dates you enter are never uploaded, logged, or stored.

Frequently Asked Questions

How is the due date calculated?
By Naegele's rule: the estimated due date is 280 days (40 weeks) from the first day of your last menstrual period. If you calculate by conception date instead, it's about 266 days from conception. The tool adjusts for cycle lengths other than 28 days.
How accurate is an estimated due date?
It's an estimate. Only about 1 in 20 babies arrive exactly on the due date; most are born within two weeks either side. An early ultrasound is the most accurate way to date a pregnancy — this calendar method is a useful guide, not a guarantee.
What if my cycle isn't 28 days?
Use the cycle-length slider. A longer cycle means you ovulate later, so conception — and the due date — shift accordingly. The tool accounts for this when you calculate by last period.
Is this medical advice?
No. This tool is informational only and is not a diagnosis or a substitute for professional antenatal care. Always confirm your due date and any concerns with your doctor or midwife.
Is my information stored?
No. The calculation runs entirely in your browser. The dates you enter are never uploaded, logged, or stored.
📖

Want to understand the math?

Browse all guides →
How Due Dates Are Calculated
pregnancy

How Due Dates Are Calculated: Naegele's Rule, LMP & Conception

A clear guide to how a pregnancy due date is estimated — Naegele's rule from the last period, the conception-date method, why cycle length matters, and why ultrasound dating is most accurate.

25 Jun 2026

5 min read

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