Pregnancy & Conception Calculator

Estimate your due date and key pregnancy milestones with precision.

Calculator Method

Last Period (LMP)

Conception Date

First Day of Last Period

Cycle Length

Your Estimated Due Date

–

Days Remaining: –

Conception Window –

Current Status –

Trimesters Breakdown

First Trimester

–

Second Trimester

–

Third Trimester

–

*Estimates based on Naegele’s rule. Actual dates may vary by 1-2 weeks. Consult your healthcare provider.

Plan Your Pregnancy Journey

The Pregnancy & Conception Calculator is designed to give expectant parents a clear timeline of their pregnancy. Whether you calculate from your Last Menstrual Period (LMP) or a known conception date, this tool provides key milestones including your trimesters and estimated due date (EDD).

How We Calculate

This calculator primarily uses Naegele’s Rule, the standard method used by obstetricians worldwide.

LMP Method: Adds 280 days (40 weeks) to the first day of your last period, adjusting for your specific cycle length.
Conception Method: Adds 266 days (38 weeks) from the date of conception.

User Reviews

“My doctor used the same method! The trimester breakdown helped us plan our announcements.”

– Emily R., Expecting Mom

“Simple, beautiful interface. It was spot on for our first ultrasound date.”

– Jason & Clara

Frequently Asked Questions

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.

Why does cycle length matter?

Ovulation usually occurs 14 days before the end of your cycle. A longer or shorter cycle shifts the conception window, which affects the due date calculation.