Skip to main content
AIPULY

Pregnancy Due Date Calculator

Estimate your pregnancy due date and trimester dates from your last menstrual period using Naegele's rule.

Estimate your expected due date and trimester milestones from the first day of your last menstrual period.

How to use it

  1. 1Pick the first day of your last menstrual period.
  2. 2Adjust your average cycle length if it isn't 28 days.
  3. 3View your estimated due date and trimester dates.

Your cycle

Enter the first day of your last menstrual period.

days

Not medical advice

This is an estimate only — always confirm dates and progress with your midwife or doctor.

Result

Fill in the fields above and your result will appear here.

Frequently asked questions

How accurate is a due date estimate?
Only about 5% of babies arrive exactly on their due date — it's an estimate, and your doctor may refine it with ultrasound dating.
What if my cycle isn't 28 days?
Adjust the cycle length field; longer or shorter cycles shift ovulation and therefore the estimated due date.
Is this a substitute for medical care?
No, always confirm dates and monitor your pregnancy with a qualified healthcare provider.

Something wrong with this tool or its numbers?

Report an issue

Recommended next

What people usually reach for after this tool.

BMI Calculator

Calculate your Body Mass Index in metric or imperial units and see your WHO weight category instantly.

Health

Daily Calorie Calculator

Calculate your daily calorie needs to lose, maintain or gain weight based on your TDEE and goal.

Health

BMR Calculator

Estimate your Basal Metabolic Rate with the Mifflin-St Jeor formula and see your daily calorie needs (TDEE).

Health

Related articles

Illustration of a body silhouette with measurement arcs representing BMI
Health

What BMI tells you, and what it definitely does not

BMI is a fast population-level screen. Here is how to read it without over-interpreting it.

5 min read
Illustration of rising bar charts and stacked coins representing freelance pricing
Business

How to price freelance work without guessing

A repeatable pricing method built on utilisation, target income and value-based adjustments.

7 min read
Illustration of a receipt with a percentage symbol representing VAT
Finance

VAT explained simply for small businesses

What VAT actually is, when you have to register, and how to keep the arithmetic painless.

6 min read

Popular tools

The calculators people reach for most.

All tools

New tools, every week

One short email when we ship something genuinely useful. No spam, unsubscribe anytime.