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Pregnancy Calculator

Calculate due date and track pregnancy progress.

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Pregnancy Calculator

Calculate your due date, track your progress, and discover key milestones in your journey.

Calculation Basis

Calculate Based On:

First Day of Last Period

Average Cycle Length (Days)

*28 days is average

Standard pregnancy calculations assume a 28-day cycle with ovulation on day 14. We adjust these estimates based on your cycle length.

Medical Disclaimer: This calculator is for informational purposes only. Consult your healthcare provider for medical advice, diagnoses, or clinical decisions.

Estimated Due Date

May 12, 2027

Status

0w 0d

Trimester

Trimester 1

Days to Go

279 Days

Pregnancy Progress

ConceptionDue Date

Conception Date

August 19, 2026

End of 1st Trimester

November 4, 2026

End of 2nd Trimester

February 3, 2027

Viability Milestone

February 3, 2027

Note: Most babies arrive between 37 and 42 weeks. Only about 4% of babies are born exactly on their due date.

How Your Due Date is Calculated

A standard human pregnancy is approximately 40 weeks (280 days) from the first day of your last menstrual period (LMP). However, conception usually happens about two weeks after your period starts.

Calculation Methods:

LMP Method: Uses Naegele's rule, adding 280 days to the first day of your last period.
Conception Method: If you know exactly when you conceived, we add 266 days to that date.
IVF Method: Calculated based on the transfer date and whether it was a 3-day or 5-day embryo transfer.

Trimester 1

Weeks 1-12. Crucial development of organs and basic structures.

Trimester 2

Weeks 13-26. The "golden period" where morning sickness often fades.

Trimester 3

Weeks 27-40. Rapid growth and preparation for the big arrival.

General Disclaimer: AI-generated content is provided "as is" for informational purposes. No guarantee of accuracy, completeness, or fitness for a particular purpose is made. Verify critical information independently. Use at your own risk.

How It Works

Choose method

Enter date

View results

Choose method

Select LMP, conception, due date, ultrasound, or IVF calculation.

Enter date

Provide your last period date, conception date, or due date.

View results

See your estimated due date, current progress, and key milestones.

Quick Answers

How is due date calculated?

Standard pregnancy is 40 weeks (280 days) from LMP. We adjust for cycle length and calculation method.

How accurate is the due date?

Only about 4% of babies arrive exactly on their due date. Most arrive between 37-42 weeks.

Related Tools

How Your Due Date is Calculated

A standard human pregnancy is approximately 40 weeks (280 days) from the first day of your last menstrual period (LMP). However, conception usually happens about two weeks after your period starts.

Calculation Methods:

LMP Method: Uses Naegele's rule, adding 280 days to the first day of your last period.
Conception Method: If you know exactly when you conceived, we add 266 days to that date.
IVF Method: Calculated based on the transfer date and whether it was a 3-day or 5-day embryo transfer.