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Pregnancy Due Date Calculator

Estimate your due date and see week-by-week milestones.

  • 🧮 Calculator
  • ✓ Free
  • ✓ No sign-up
  • ✓ Private — runs in your browser
  • ✓ Any device

28 days is the standard assumption (Naegele's rule).

We back-date to a conception-equivalent age.

As printed on your scan report (e.g. "8w 3d").

Quick set:

Why you’ll love Pregnancy Due Date Calculator

Instant & freeNo signup, no paywall, no limits — Pregnancy Due Date Calculator works the moment the page loads.
Completely privateEverything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any deviceFully responsive and touch-friendly — use it on your phone, tablet or desktop.
Accurate & clearBuilt on the real formulas, with a breakdown you can actually trust.

How to use it

  1. 01

    Open it

    No download and no login — the tool is ready right at the top of this page.

  2. 02

    Use it

    Enter your details or start interacting. Everything updates live as you go.

  3. 03

    Get your result

    Copy, download or share your result in a single tap. That’s it.

About Pregnancy Due Date Calculator

A pregnancy due date calculator estimates your expected delivery date based on your last menstrual period or conception date. Enter your dates and get your estimated due date (EDD) instantly, along with how many weeks and days you're currently at in your pregnancy. This free due date calculator runs entirely in your browser—no account needed, and your information never leaves your device.

Track your pregnancy timeline week by week with key milestones and development stages. The pregnancy calculator shows you what to expect at each stage, from the first trimester through delivery. Whether you're planning ahead or tracking your current pregnancy, this tool gives you a clear picture of your due date and the journey ahead.

Knowing your accurate due date helps you prepare for appointments, plan time off work, and understand what's happening in each stage of pregnancy. Our calculator accounts for the standard 40-week pregnancy and works whether you track from your last period or know your conception date. Quick, private, and free—no signup required.

Popular uses

  • ✦ Expectant parents planning time off work and preparing the nursery before their due date.
  • ✦ Healthcare providers quickly communicating expected delivery dates with patients during appointments.
  • ✦ Pregnancy tracking from the first positive test through all 40 weeks of development.
  • ✦ Understanding fetal development milestones and what to expect at each stage.
  • ✦ Confirming due date calculations between home tracking and medical appointments.

Frequently asked questions

How accurate is a due date calculator?
A due date calculator is typically accurate within a few days, but it's an estimate only. Your actual due date may vary based on cycle length, ovulation timing, and other factors. Your doctor or midwife can refine your due date with an ultrasound, especially in the first trimester. Use this calculator as a starting point, not a guarantee.
What's the difference between LMP and conception date?
Your last menstrual period (LMP) is the first day of your last period, while conception date is when fertilization occurred—typically 12-16 days after your LMP. Most due date calculators use LMP because it's easier to remember. If you know your conception date, select that option instead for potentially greater accuracy.
Is my data stored or shared when I use this calculator?
No. This calculator runs entirely in your browser, so your dates and information never leave your device. There's no server storage, no tracking, and no account required. Your privacy is protected by default.
Can I use this calculator if I have an irregular cycle?
This calculator assumes a standard 28-day cycle, which may not apply to irregular cycles. If your cycle is consistently longer or shorter, your due date estimate could shift by several days. Discuss your specific cycle with your doctor or midwife for a more personalized due date.
Is Pregnancy Due Date Calculator free to use?
Pregnancy Due Date Calculator is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
How accurate is this calculator?
It uses the standard formulas and shows its working, so you can verify every number. For big decisions, treat the result as a reliable estimate.

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