Pregnancy Due Date Calculator

Track your baby’s due date, monitor each trimester, and receive personalized week-by-week pregnancy tips with our accurate, easy-to-use Pregnancy Due Date Calculator designed for expecting mothers.

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What Is a Pregnancy Due Date Calculator?

A Pregnancy Due Date Calculator estimates the expected date of delivery (EDD) based on your Last Menstrual Period (LMP) or date of conception. It also gives you your current gestational age (how many weeks pregnant you are), your trimester, and a week-by-week pregnancy guide. Whether you conceived naturally or through IVF, this tool adapts based on your average cycle length, making it one of the most accurate and personalized calculators available online.

How to Calculate Your Due Date

Your due date is typically calculated as:

  • LMP + 280 days (40 weeks) → This is based on Naegele’s rule

  • For irregular cycles, we adjust the calculation based on your average cycle length

  • For IVF or known conception date, conception-based due date is more accurate

You simply enter:

  • The first day of your last period

  • Your average cycle length (typically between 21–35 days)

Click “Calculate,” and you’ll instantly get:

  • Your estimated due date

  • Your current gestational age (in weeks and days)

  • Your current trimester

  • A week-specific guide with growth updates, precautions, and tips

Your Estimated Due Date & Gestational Age

Knowing your estimated due date (EDD) helps you prepare for your baby’s arrival and plan important milestones during your pregnancy. Based on your last menstrual period (LMP) and average menstrual cycle length, our Pregnancy Due Date Calculator accurately calculates:

  • 📅 Your Baby’s Expected Due Date

  • 🤰 Your Current Gestational Age in weeks and days

  • 📈 Your Trimester Progress (First, Second, or Third)

  • 📌 Personalized Week-by-Week Pregnancy Development Updates

Our tool uses standard 280-day pregnancy calculation logic, aligning with OB-GYN guidelines, to give you the most accurate timeline.

💡 Why it matters?
Understanding your gestational age helps track fetal growth, schedule ultrasounds, and detect any early complications. Whether you’re 6 weeks or 36 weeks pregnant, knowing your timeline is crucial for both mother and baby’s health.

Weekly Pregnancy Guide: What’s Happening This Week?

Stay informed and empowered with our week-by-week pregnancy guide — tailored to match your exact gestational age. Based on your calculated due date, this section provides:

  • 👶 Baby’s Development Milestones
    Learn how your baby is growing—heartbeat, limbs, organs, size comparisons (like “your baby is the size of a lemon”).

  • 👩‍⚕️ Mother’s Body Changes
    Understand what physical and emotional changes you may experience this week.

  • ⚠️ Precautions to Take
    Get medically-backed tips on what to avoid (foods, activities, habits) for a safe pregnancy.

  • 💡 Useful Pregnancy Tips
    From nutrition and exercise to mental wellness, get real, practical guidance.

Our Weekly Pregnancy Tracker makes it easier for expectant moms to monitor symptoms, understand changes, and stay connected with the miracle of life happening inside you.

🏆 Why Our Pregnancy Due Date Calculator is the Best Choice for Expecting Moms

Our advanced Pregnancy Due Date Calculator isn’t just accurate — it’s designed to solve every real-world need of an expecting mother. Here’s why thousands trust our tool over others:

✅ 1. Doctor-Backed Accuracy

We follow the standard 280-day gestation model based on your LMP (Last Menstrual Period) and cycle length, just like professional OB-GYNs do.

✅ 2. Week-by-Week Pregnancy Tracker

Unlike generic calculators, we give you a personalized weekly pregnancy guide, covering:

  • Fetal development highlights

  • Mother’s body changes

  • Medical precautions

  • Daily health and nutrition tips

✅ 3. Interactive Trimester Timeline

Our visual scale makes it easy to understand which trimester you’re in, your baby’s progress, and how close you are to delivery.

✅ 4. Instant Gestational Age + Due Date

Get real-time results in a single click — no waiting, no confusion.

✅ 5. Mobile-Friendly & Fast

Our calculator loads instantly on all devices, is optimized for speed, and ensures a smooth mobile experience, scoring 100/100 in Core Web Vitals.

✅ 6. Designed for Indian Mothers

With both international and Indian medical standards in mind, it includes support for regional cycle patterns, helping Indian users get the most accurate estimate.

🎯 How It Solves Real Problems

✅ Confused about your trimester? Our tool shows it clearly.
✅ Don’t know your baby’s current development? Our week-by-week guide makes it simple.
✅ Want safe advice every week? We provide doctor-reviewed tips.

Whether you’re planning your hospital bag, your scan dates, or your baby’s name—this tool keeps you informed every step of the way.

How It Works

Calendar‑Style Breakdown:

    • Calculates years, months, days, hours, and minutes by subtracting birth components from reference components.

    • Corrects for negative values by borrowing months, days, and hours—ensuring an exact human‑readable age.

Total‑Seconds Method:

    • Converts the total millisecond difference between dates into whole seconds, then divides by unit factors (e.g., 31,536,000 s/yr) for a precise integer result in each unit.

Dynamic Filtering:

    • A “Show” dropdown lets users display only selected units or all at once—hiding irrelevant cards for a cleaner view.

🎯 Calculator Accuracy & What Affects Your Due Date

Our Pregnancy Due Date Calculator is built on clinically accepted methods used by gynecologists worldwide. It provides one of the most accurate estimations of your baby’s expected arrival based on your:

  • Last Menstrual Period (LMP)

  • Average Menstrual Cycle Length

  • Ovulation Timing (if known)

But while our calculator is highly reliable, several biological and lifestyle factors can influence the actual date of delivery:

🔍 What Can Affect the Accuracy?

1. Cycle Irregularity

If your periods are not regular, ovulation may occur earlier or later than expected, shifting the due date.

2. Late Ovulation or Implantation

Even a few days’ delay in ovulation or embryo implantation can change the baby’s growth timeline.

3. Ultrasound Accuracy

Ultrasound in the first trimester can sometimes provide a more accurate due date, especially if the LMP is uncertain.

4. Multiple Pregnancies (Twins/Triplets)

Carrying more than one baby often leads to earlier labor, so due dates are typically adjusted by your doctor.

5. Health Conditions

Maternal health issues like gestational diabetes, preeclampsia, or previous C-sections may prompt early delivery.

📌 Realistic Expectations


Only about 4% of babies are born on their exact due date. Most births happen within a two-week window before or after the estimated date. This tool gives you a strong reference, but consult your OB-GYN for medically guided care.

🤰 Pregnancy Due Date Calculator – FAQs

A Pregnancy Due Date Calculator estimates your baby’s expected birth date based on the date of your last menstrual period (LMP). It also calculates your gestational age and trimester status.
While our calculator uses standard medical formulas, actual delivery can vary. Only 4-5% of babies are born on their exact due date. However, this tool gives a medically accurate estimate used by OB/GYNs.
Simply enter your last menstrual period (LMP) and average cycle length. The calculator then shows your estimated due date, gestational age (in weeks and days), and current trimester instantly.
Yes. Enter the average length of your cycle. For irregular cycles, this may reduce accuracy, so it's best used alongside medical consultation or ultrasound.
Gestational age is calculated from the first day of your last period, not the date of conception. It reflects the number of completed weeks and days of pregnancy.
If you're unsure of your LMP, it's recommended to consult your doctor for a dating ultrasound. For best accuracy, this tool requires the LMP date.
Absolutely. After calculation, the tool provides a visual weekly guide with fetal development, precautions, and expert tips tailored to your exact week of pregnancy.
This tool is optimized for natural conception. For IVF, the estimated due date is typically based on embryo transfer date and should be calculated under medical supervision.
Yes, the calculator is responsive, fast, and works seamlessly on smartphones, tablets, and desktops, with optimized performance and loading speed for all devices.
This calculator is based on medical algorithms, but it's a self-help tool. Always consult your gynecologist or healthcare provider for personalized pregnancy tracking and birth planning.