Pregnancy Due Date Calculator — Gregorian & Hijri

How Does the Calculator Work?

3 simple steps for 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 or Hijri calendar.

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Step 2

Click "Calculate Now"

The calculator uses Naegele's Rule — the medically accepted standard for due date calculation.

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Step 3

Get accurate results

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

The Three Trimesters of Pregnancy

Each stage of your pregnancy has its unique characteristics

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First Trimester

Weeks 1 – 12

The most critical stage. Your baby forms from a single cell into a complete being. Morning sickness, fatigue, and heightened sensitivity to smells are the most common symptoms.

Weeks 1–12 details →

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Second Trimester

Weeks 13 – 26

Called the "honeymoon phase" because nausea fades and energy returns. You'll start feeling your baby's first movements — an unforgettable moment!

Weeks 13–26 details →

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Third Trimester

Weeks 27 – 40

The preparation phase! Baby gains weight and prepares for life. Your body prepares for delivery and you may experience Braxton Hicks contractions.

Weeks 27–40 details →

Other Useful Tools

Everything you need to track your pregnancy in one place

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Ovulation Calculator

Find your most fertile days and the best time to conceive

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Period Calculator

Predict your next period dates for the next 6 months

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Week-by-Week Guide

Track your pregnancy development from week 1 to week 40

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Articles & Guides

Comprehensive guides on pregnancy symptoms, labor signs, and more

Frequently Asked Questions

Answers to the most common pregnancy questions

How does the pregnancy calculator work?

The calculator uses Naegele's Rule, the globally accepted medical standard: it adds 280 days (40 weeks) to the first day of your last menstrual period to get the expected due date. This is the same method used by doctors and obstetricians worldwide.

Is the pregnancy calculator accurate?

The calculator is mathematically accurate according to established 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. A first-trimester ultrasound (weeks 8–12) is the most accurate way to confirm your due date.

How are pregnancy weeks counted?

Pregnancy weeks are always counted from the first day of your last menstrual period, not from the date of conception. A full-term pregnancy is 40 weeks (280 days). For example: if your last period started 7 weeks ago, you are in the 7th week of pregnancy.

When should I see a doctor to confirm my due date?

Book your first appointment with your doctor as soon as you confirm your pregnancy. The first ultrasound is usually done between weeks 8 and 12 and is the most accurate for determining your due date. Remember, our calculator is a guide only and doesn't replace regular medical care.

What's the difference between Gregorian and Hijri calculation?

Medical calculations use the Gregorian solar calendar. The Hijri calendar is lunar with shorter months (~29.5 days). Our calculator automatically converts Hijri dates to Gregorian for accurate medical calculation.

Pregnancy Calculator — Calculate Your Due Date

Follow your pregnancy week by week 🌙