How accurate is the due date?

Only about 5% of babies are born on their exact due date. Most are born within two weeks before or after.

What determines the due date?

It is roughly 40 weeks from the first day of your last period, assuming a 28-day cycle.

Why count from the last period?

Because most women know when their last period started, but ovulation/conception day is harder to pinpoint exacty.

Pregnancy Due Date Calculator

Calculate your estimated due date, current week of pregnancy, and trimester milestones.

due datepregnancyconceptiontrimester

Disclaimer: This tool provides estimates for informational and educational purposes only. It does not constitute professional financial, medical, or legal advice. Please consult with a qualified professional before making any significant decisions based on these estimations.

Common Use Cases

general awareness and educational estimates
wellness planning alongside professional guidance
tracking simple ranges over time

What is Pregnancy Due Date Calculator?

The Pregnancy Due Date Calculator estimates your delivery date using Naegele's Rule (LMP + 280 days) or your conception date. It tracks your pregnancy timeline, showing which trimester you are in, weeks pregnant, and days remaining until your baby arrives.

How to Use This Tool

1Enter the first day of your last period OR conception date
2View your estimated due date
3See your current pregnancy progress and trimester

Example

Input

LMP: Jan 1st

Output

Due Date: Oct 8th

Before You Rely on This Result

UtilityNest keeps tools in this category focused on transparency: short instructions, a worked example, and plain-language guidance so you can review the result before you depend on it.

Check that the inputs reflect your real situation before you rely on the estimate.
Rules, rates, health needs, and legal requirements may vary by country, state, insurer, or provider.
Use this result as a starting point, then confirm important decisions with official sources or a qualified professional.

Frequently Asked Questions

Try these related tools

BMI Calculator

Calculate your Body Mass Index (BMI) and find your weight category. Supports metric and imperial units.

Water Intake Calculator

Calculate how much water you should drink daily based on your weight, activity level, and climate.

BMR/TDEE Calculator

Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) for diet planning.

Body Fat Percentage Calculator

Calculate your body fat percentage using the US Navy method. Track your fitness progress accurately.