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Pregnancy Calculator

A pregnancy calculator helps expectant mothers calculate their due date, track pregnancy progress, and understand important milestones throughout their pregnancy journey. Use our free pregnancy calculator to determine your estimated due date, conception date, and current pregnancy week based on your last menstrual period or conception date. This tool provides a comprehensive pregnancy timeline showing fetal development stages, trimester information, and key pregnancy milestones. Calculate your pregnancy timeline instantly to plan for your baby's arrival and monitor your pregnancy progress week by week.

Calculate Pregnancy Timeline Now

Free • Due date • Pregnancy tracking • Milestones

How Pregnancy Calculation Works

1
Enter LMP: Input your last menstrual period date.
2
Or Conception Date: Enter known conception date.
3
Calculate Due Date: Get estimated due date (280 days).
4
View Timeline: See pregnancy weeks and milestones.

Pregnancy Calculation Formula

Due Date = LMP + 280 days (40 weeks)

Conception Date: LMP + 14 days (approximately)

Trimesters: 1st (0-13 weeks), 2nd (14-27 weeks), 3rd (28-40 weeks)

Gestation: 38 weeks from conception, 40 weeks from LMP

Accuracy: ± 2 weeks for natural conception

Example Pregnancy Calculation

With a last menstrual period of January 1, 2024, the estimated due date is October 7, 2024. The conception date is approximately January 15, 2024. At 20 weeks pregnant (around May 20, 2024), the baby is halfway through development and the mother can feel the baby's movements.

This timeline helps expectant parents plan for their baby's arrival.

Benefits of Pregnancy Calculator

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Due Date Planning: Prepare for baby's arrival.
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Pregnancy Tracking: Monitor week-by-week progress.
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Milestone Planning: Schedule prenatal appointments.
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Preparation Time: Plan maternity leave and baby prep.

Frequently Asked Questions

How accurate are pregnancy due dates?

Due dates are estimates with ± 2 weeks accuracy. Only 5% of babies are born on their exact due date. Most arrive between 37-42 weeks.

What's the difference between gestational age and fetal age?

Gestational age counts from LMP (40 weeks total). Fetal age counts from conception (38 weeks total). Doctors use gestational age.

When do pregnancy symptoms typically start?

Early symptoms like morning sickness typically start around 4-6 weeks after LMP, about 2-4 weeks after conception.

Related Health & Pregnancy Calculators

Due Date Calculator
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Pregnancy Conception Calculator
Calculate conception date
BMI Calculator
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Weight Gain Calculator
Calculate healthy pregnancy weight gain

Calculate Your Pregnancy Timeline

Track your pregnancy journey and prepare for your baby's arrival with our comprehensive pregnancy calculator.

Use Pregnancy Calculator