Pregnancy Due Date Calculator

Pregnancy Due Date Calculator - Estimate Delivery | StoreDropship

Free Online Pregnancy Due Date Calculator – Estimate Your Delivery Date

Pregnancy Due Date Calculator helps you estimate your expected delivery date accurately using three proven methods. Calculate by last menstrual period (LMP), conception date, or IVF transfer date. Get instant results with trimester timeline, weekly progress, and key pregnancy milestones — all completely free and private.

Calculate Your Estimated Due Date

Select the first day of your most recent menstrual period
Normal range is 21-35 days. Default: 28 days
Your Estimated Due Date
Current Week
Days Remaining
Conception Date
Estimated
Trimester Timeline
1st Trimester
2nd Trimester
3rd Trimester
1st Trimester
2nd Trimester
3rd Trimester
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First Heartbeat (~6 weeks)
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First Ultrasound (~8 weeks)
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First Movements (~16 weeks)
👶
Gender Reveal (~20 weeks)
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Viability (~24 weeks)
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Full Term (~39 weeks)
🔒 Your privacy is safe. All processing happens in your browser. No data is stored or sent to any server.

How to Use the Pregnancy Due Date Calculator

1

Select Calculation Method

Choose your preferred calculation method from LMP (Last Menstrual Period), Conception Date, or IVF Transfer Date.

2

Enter Date Information

Enter the relevant date based on your selected method. For LMP, enter the first day of your last menstrual period.

3

Set Cycle Length

If using LMP method, set your average menstrual cycle length. The default is 28 days but you can adjust between 20-45 days.

4

Click Calculate Due Date

Click the Calculate Due Date button to instantly see your estimated delivery date along with trimester timeline.

5

Review Your Results

Review your estimated due date, current pregnancy week, trimester progress, and key milestone dates. Copy or print results for your records.

Key Features of Our Due Date Calculator

🆓

100% Free to Use

Calculate your pregnancy due date unlimited times without any charges, subscriptions, or hidden fees whatsoever.

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Medically Accurate

Uses Naegele's Rule — the same standard formula trusted by obstetricians and gynecologists worldwide for due date estimation.

⚡

Instant Results

Get your estimated due date, trimester timeline, and milestone dates instantly with zero waiting time or page reloads.

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Complete Privacy

All calculations happen in your browser. No health data is ever stored, transmitted, or shared with anyone anywhere.

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No Signup Required

Start calculating immediately without creating accounts, providing email addresses, or any registration process needed.

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Mobile-Friendly Design

Works perfectly on smartphones, tablets, and desktops with responsive design optimized for touch interactions and all screen sizes.

How Due Date Calculation Works

LMP Method: Due Date = LMP + 280 days + (Cycle Length − 28) days Conception Method: Due Date = Conception Date + 266 days IVF Method: Due Date = Transfer Date + (266 − Transfer Day) days

Calculation Components

Last Menstrual Period (LMP): The first day of your most recent menstrual period. This is the starting point for the most commonly used due date calculation method, also known as Naegele's Rule.
280 Days (40 Weeks): The standard gestational period from LMP to estimated delivery. This accounts for approximately two weeks before conception actually occurs, making the total pregnancy duration 40 weeks from LMP.
Cycle Length Adjustment: If your menstrual cycle differs from the standard 28 days, the formula adjusts by adding or subtracting the difference. A 32-day cycle adds 4 extra days to the due date estimate.
266 Days (38 Weeks): The actual gestational period from conception to delivery. This is used when the conception date is known precisely, such as in IVF pregnancies or when ovulation tracking was performed.
IVF Transfer Day Adjustment: For IVF pregnancies, the embryo age at transfer is subtracted. A Day 3 embryo transfer subtracts 3 days, while a Day 5 blastocyst transfer subtracts 5 days from the 266-day period.

For example, if Meera from Pune has her LMP on 1st January 2025 with a 28-day cycle, her estimated due date would be 8th October 2025. If she has a 30-day cycle instead, the due date shifts to 10th October 2025. These calculations follow the same medical standards used in Indian hospitals and maternity clinics nationwide. Always remember that the estimated due date is an approximation, and your obstetrician may adjust it based on ultrasound findings during your first trimester visits.

Pregnancy Due Date Calculation Examples

🏥 Priya — LMP Method (28-Day Cycle)

Input: LMP: 15th March 2025, Cycle: 28 days

Result: Due Date: 20th December 2025

Use Case: Priya from Delhi uses this to plan her maternity leave and schedule prenatal checkups at her local government hospital.

👩‍⚕️ Anita — LMP Method (32-Day Cycle)

Input: LMP: 1st February 2025, Cycle: 32 days

Result: Due Date: 12th November 2025

Use Case: Anita from Mumbai has slightly longer cycles. The calculator adjusts her due date by adding 4 extra days compared to a standard 28-day cycle calculation.

🧬 Kavitha — Conception Date Method

Input: Conception Date: 20th April 2025

Result: Due Date: 11th January 2026

Use Case: Kavitha from Bengaluru tracked her ovulation and knows the exact conception date, giving her a more precise due date than the LMP method.

🔬 Deepika — IVF Day 5 Transfer

Input: Transfer Date: 10th May 2025, Day 5 Blastocyst

Result: Due Date: 26th January 2026

Use Case: Deepika from Chennai conceived through IVF at a fertility clinic. The IVF method gives her the most accurate due date since the exact transfer date and embryo age are known precisely.

What is a Pregnancy Due Date Calculator?

A Pregnancy Due Date Calculator is a health estimation tool that helps expecting mothers determine their estimated delivery date (EDD) based on key reproductive dates. It uses medically established formulas — primarily Naegele's Rule — to calculate when a baby is most likely to be born. While the tool provides an estimate based on averages, it serves as an excellent starting point for pregnancy planning and prenatal care scheduling.

This free online calculator is designed for expectant mothers, their families, healthcare workers, and anyone in India or internationally who wants a quick, private, and accurate due date estimation. Whether you conceived naturally or through assisted reproductive techniques like IVF, the calculator offers three distinct methods tailored to your situation. It also provides a comprehensive trimester timeline, current pregnancy progress, and important milestone dates.

Our calculator follows the same clinical standards used by obstetricians and gynecologists at leading Indian hospitals including AIIMS, Fortis, Apollo, and government maternity centres. The results include your current gestational week, trimester breakdown, estimated conception date, and six key developmental milestones. We strongly recommend using this tool alongside professional medical advice. Your doctor's ultrasound-based assessments, particularly during the first trimester, remain the gold standard for confirming gestational age and fine-tuning your expected delivery date.

Frequently Asked Questions

Yes, this Pregnancy Due Date Calculator is completely free to use with no hidden charges, subscriptions, or premium features. You can calculate your estimated due date unlimited times using any of the three methods — LMP, conception date, or IVF transfer date — without paying anything. There is no registration or signup required to access any feature of this calculator.
Absolutely. Your privacy is our top priority. This calculator runs entirely in your web browser using client-side JavaScript. No personal health data, dates, or any information you enter is ever sent to any server, stored in any database, or shared with any third party. Once you close or refresh the page, all entered data is completely gone. This makes it one of the most private pregnancy calculators available online.
This calculator uses the same Naegele's Rule formula that doctors and gynecologists use worldwide to estimate due dates. The LMP method adds 280 days (40 weeks) to the first day of your last menstrual period, adjusted for cycle length. However, only about 5% of babies are born exactly on their estimated due date. Most deliveries occur within a two-week window around the due date. Always consult your doctor for ultrasound-based confirmation.
Naegele's Rule is the standard medical formula for estimating pregnancy due dates. It works by adding 280 days (40 weeks) to the first day of the last menstrual period (LMP) for a standard 28-day cycle. If your cycle is longer or shorter than 28 days, the formula adjusts accordingly by adding or subtracting the difference. This rule has been used by obstetricians worldwide for over 200 years and remains the primary method for initial due date estimation.
The LMP method calculates from the first day of your last menstrual period and is the most commonly used method. The Conception Date method calculates from the actual date of conception or ovulation and adds 266 days (38 weeks). The IVF method is specifically designed for women who conceived through in vitro fertilization, calculating from the embryo transfer date and adding either 266 days for Day 3 transfer or 263 days for Day 5 (blastocyst) transfer.
A full-term pregnancy is generally considered to be 40 weeks (280 days) from the first day of the last menstrual period, or 38 weeks (266 days) from conception. However, medical professionals define full term as between 39 weeks 0 days and 40 weeks 6 days. Babies born between 37-38 weeks are considered early term, while those born after 41 weeks are considered late term. Most healthy pregnancies last between 38-42 weeks.
If you have irregular periods, the LMP method may be less accurate. In such cases, you have two better options: use the Conception Date method if you know when you ovulated or conceived, or consult your doctor for an ultrasound-based estimation. Ultrasound measurements in the first trimester are typically the most accurate way to determine gestational age when menstrual cycles are irregular. You can also adjust the cycle length field in our calculator.
Pregnancy is divided into three trimesters. The First Trimester spans weeks 1-12 and involves major organ development, morning sickness, and early prenatal care. The Second Trimester covers weeks 13-27, often called the most comfortable period, when the baby grows significantly and movements become noticeable. The Third Trimester runs from week 28 until delivery (around week 40), when the baby gains weight rapidly and the body prepares for labor and delivery.
You should schedule your first prenatal appointment with a gynecologist as soon as you confirm pregnancy, ideally between 6-8 weeks of gestation. In India, most government hospitals and private clinics recommend the first visit within the first trimester. Your doctor will confirm the due date through ultrasound, start prenatal vitamins, and plan your antenatal care schedule. Regular checkups are recommended monthly until 28 weeks, then fortnightly until 36 weeks, and weekly until delivery.
The average menstrual cycle length is 28 days, which is the default setting in our calculator. However, normal cycles can range from 21 to 35 days. If your cycle is consistently shorter (say 25 days) or longer (say 32 days), enter your actual average cycle length for a more accurate due date. The calculator adjusts the due date based on your cycle length, as ovulation typically occurs 14 days before the next expected period regardless of total cycle length.
Yes, your estimated due date may be adjusted during pregnancy, especially after your first ultrasound. If the ultrasound measurements show a significant difference (more than 5-7 days) from the LMP-calculated date, your doctor may revise the due date. First trimester ultrasounds (before 13 weeks) are the most accurate for dating. Later ultrasounds become less precise for estimating gestational age because babies grow at different rates in later pregnancy stages.
Only about 4-5% of babies are born exactly on their estimated due date. The due date is really an estimate of the most likely delivery period rather than an exact prediction. About 80% of babies are born within two weeks of the due date (between 38-42 weeks). First-time mothers in India tend to deliver slightly past their due date on average. Factors like genetics, maternal health, nutrition, and whether it is a first or subsequent pregnancy can all influence actual delivery timing.
Yes, our calculator includes a dedicated IVF Transfer Date method specifically designed for IVF pregnancies. You can select either Day 3 embryo transfer or Day 5 blastocyst transfer, and the calculator will adjust accordingly. For Day 3 transfers, it adds 263 days to the transfer date, and for Day 5 transfers, it adds 261 days. This method is considered more accurate than LMP for IVF pregnancies because the exact fertilization and transfer dates are known precisely.

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