Pregnancy Calculator — Calculate Your Due Date

Your companion on the journey to motherhood — track your pregnancy week by week, free

✓ 100% Free ✓ No registration ✓ Medically accurate
🤰 Pregnancy 🔴 Period 🌸 Ovulation

⚠️ Enter the first day of your last period, not the conception date

Please enter a valid date — not more than 10 months in the past or in the future

💫 We'll subtract 14 days to get your LMP date and calculate your due date

Please enter a valid date — not more than 10 months in the past or in the future

🗓️ Expected Due Date

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Current pregnancy age
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Baby's size now
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approximately
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Days remaining until birth
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Pregnancy completion
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Start of pregnancyDue date
📖 Follow your current week
⚠️ Note: This calculator is for educational purposes only and does not replace professional medical advice.

How Does the Calculator Work?

3 simple steps to get an accurate result

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Step 1

Enter your last period date

Enter the first day of your last menstrual period in Gregorian calendar.

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Step 2

Click "Calculate Now"

The calculator uses the medically accepted Naegele's Rule to calculate your expected due date.

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Step 3

Get accurate results

You'll know your due date, current pregnancy age, baby's size, and days remaining.

The Three Trimesters

Each trimester of your pregnancy has its own unique characteristics

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First Trimester

Weeks 1 – 12

The most critical stage of pregnancy. Your baby develops from a single cell to a fully-formed human being. Morning sickness, fatigue, and heightened sensitivity to smells are common symptoms.

Weeks 1–12 details →
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Second Trimester

Weeks 13 – 26

Called the "honeymoon trimester" — nausea subsides and energy returns. You'll feel your baby's first movements — an unforgettable moment.

Weeks 13–26 details →
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Third Trimester

Weeks 27 – 40

The preparation stage! Your baby gains weight and fat, getting ready for life. Your body prepares for labor and you may feel Braxton Hicks practice contractions.

Weeks 27–40 details →

Other Useful Tools

Everything you need to follow your pregnancy in one place

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Ovulation Calculator

Find your most fertile days and the best time to conceive
📆

Period Calculator

Predict your next periods for the coming 6 months
📅

Pregnancy Week Tracker

Follow your pregnancy week by week from week 1 to 40
💊

Pregnancy Symptoms

A comprehensive guide to early and late pregnancy symptoms

Frequently Asked Questions

Answers to the most common questions about pregnancy

How does the pregnancy calculator work?
The calculator uses Naegele's Rule — the medically accepted global standard: 280 days (40 weeks) are added to the first day of your last menstrual period to get the expected due date. This is the same method used by obstetricians worldwide.
Is the pregnancy calculator accurate?
The calculator is mathematically accurate per accepted medical standards. However, the due date is a statistical estimate — only 5% of babies are born on their exact due date. Most births occur between weeks 38 and 42. An ultrasound in the first trimester (weeks 8–12) is the most accurate way to confirm your due date.
How do I count pregnancy weeks?
Pregnancy weeks are always counted from the first day of your last menstrual period, not from the conception date. A full-term pregnancy is 40 weeks (280 days). For example, if your last period was 7 weeks ago, you are in week 7 of pregnancy.
When should I see a doctor to confirm my due date?
Book your first appointment as soon as you confirm you're pregnant. The first ultrasound is usually between weeks 8 and 12 and is the most accurate way to determine your expected due date. Our calculator is a guidance tool and does not replace regular medical follow-up.
Can I get pregnant before my period ends?
No — pregnancy occurs at ovulation when the egg is fertilized. In a 28-day cycle, ovulation typically occurs around day 14. Use the ovulation calculator to find your most fertile days.