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Pregnancy Due Date Calculator

Calculate your estimated due date instantly and track every stage of your pregnancy journey.

Most cycles run 21–35 days. Leave this at 28 if you’re not sure.

This tool provides an estimate using standard clinical formulas. It isn’t a medical diagnosis — always confirm your due date with your healthcare provider.

Thoughtful tools for every milestone

Pregnancy Tools

Simple, private tools that help you understand what is happening now and what comes next.

01 / TIMELINE

Pregnancy Week Calculator

See your current week, trimester and key dates from your due date.

Open the calculator ->02 / CYCLE

Ovulation Calculator

Understand fertile-window timing with clear, plain-language guidance.

Explore ovulation guides ->03 / PLANNING

Conception Calculator

Connect conception timing with due-date estimates and pregnancy milestones.

Explore conception guides ->04 / GROWTH

Baby Growth Tracker

Follow baby’s changing size and development with trusted weekly guides.

Browse growth guides ->

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Latest Blog Articles

New pregnancy answers, updated regularly so you can make sense of the questions that arrive unexpectedly.

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Good questions deserve clear answers

Pregnancy FAQ

A few of the questions we hear most often.

How accurate is a pregnancy due date?

Due dates are estimates, not guarantees. Only around 1 in 20 babies arrive on the exact due date, so think of it as the middle of a healthy delivery window rather than a fixed deadline.

What if I do not know the first day of my last period?

If your cycle is irregular or the date is uncertain, an early ultrasound is generally the most reliable way to date a pregnancy. Bring the estimate to your healthcare provider for confirmation.

Can my due date change during pregnancy?

Yes. An early ultrasound may adjust the estimate, especially when cycle length varies or the first day of the last period is unknown.

How many weeks pregnant am I today?

Pregnancy is dated from the first day of your last period, so gestational age is usually about two weeks ahead of conception age. This is the standard used by healthcare providers.