# Estimate the due date and track the pregnancy process using the pregnancy calculator

**Allcalculator.net** is a reliable online platform that provides a** Pregnancy Calculator** to help you estimate the expected due date and provide you with a complete pregnancy schedule. The due date is only an estimation given by the pregnancy due date calculator. The beginning of pregnancy is the day the sperm fertilizes the egg. Your due date is only an estimation given by your pregnancy due date calculator. LMP stands for Last Menstrual Period, the last period you had before you became pregnant. Pregnancy lasts, on average, for 40 weeks, equal to 280 days. Use the Pregnancy calculator on Allcalculator.net to get accurate information regarding your pregnancy journey.

**Due date calculation!**

The** Due Date Calculator** will predict the pregnancy schedule based on different methods:

Due date

Last period date

Conception date

IVF transfer date

Ultrasound date

**How will you track your pregnancy?**

To test your pregnancy, you must know about the first sign of pregnancy:

The most common signs are

Missed period

Swollen breasts

Tender

Nausea with or without vomiting

Increased urination

Fatigue

The signs mentioned above and the symptoms confirm your pregnancy, but you can also get pregnant without experiencing many symptoms. Once you confirm your pregnancy, try Allcalculator.net's pregnancy calculator week by week to get your pregnancy week's details and a trimester chart that shows you the complete details.

Based on the American College of Obstetricians and Gynaecologists revealed:

The early term is a gestation age between 37 weeks – 38 weeks and 6/7 days

Full-term is a gestation age between 39 weeks – 40 weeks and 6/7 days

The late-term is a gestation age between 41 weeks – 42 weeks and 6/7 days

Postterm is a gestation age that is longer than 42 weeks

**Calculate your due date using the pregnancy due date calculator!**

The Pregnancy calculator is a 100% free online calculator that helps you map out your pregnancy with the assistance of a calendar by the due date

** Inputs:**

- Select the last period calculation method from the menu of this due date estimator
- Add the first day of the last menstrual period into the required box
- You have to add the cycle length to the required box
- Click on the calculate button

**Output**

- You can get the result of the following:
- Possible date of conception
- Your pregnancy timeline
- Your expected due date
- Pregnancy week-by-week highlights
- Pregnancy key milestones
- Trimester chart
- Probability of birth date
- Probability of birth date by this day

**Calculate the due date – Naegele's rule!**

In this Naegele's rule, you calculate using the first day of the last menstrual period, add seven days to that and then subtract three months. This rule considers a regular menstrual cycle to be 28 days long, but it's normal for a person's cycle to vary between 21 and 45 days

**Calculate the due date – Period Wheel!**

A **Pregnancy wheel calculator** is a simple calendar that works out on EDD based on inputs such as LMP. You can use the pregnancy wheel as a timeline calculator to determine when you will have certain scans and screenings along with your trimester dates.

**Calculate the due date – Ultrasound scan!**

There are many ways to calculate an estimated due date, but an ultrasound scan in the first trimester is used to check that the dating based on the last menstrual period is correct.

**Calculate due date – Mittendorf-Williams rule!**

Calculate your due date using Allcalculator.net's LMP in the Mittendorf-Williams rule. The rule is based on a decades-old study that showed first pregnancies tend to be slightly longer, and for subsequent pregnancies, the delivery date is an average of 283 days from LMP.

Determine the first day of your last menstrual period

Countback three calendar months from that date

Add 15 days to that date if it's your first pregnancy or ten days if it's not your first pregnancy.

**Calculate the due date – Parikh’s rule!**

Parikh's rule is another theory where it is calculated by adding nine months to the date of your last menstrual period, subtracting 21 days, and then adding the duration of previous cycles. The formula is given below:

LMP + 280 days – 21 days + the average length of previous cycle

**Calculate the due date – Wood's rule!**

Wood's method considers the individual length of the menstrual cycle, where there needs to be more research on this and its effectiveness.

First, calculate your expected due date using the formulas given below:

First pregnancies: LMP + 12 months – (2 months and 14 days) = EDD

Subsequent pregnancies: LMP + 12 months – (2 months and 18 days) – EDD

Use the expected due date in the equation below:

Cycles longer than 28 days: EDD + (actual length of cycle – 28 days) = EDD

Cycles shorter than 28 days: EDD – (28 days – actual length of cycle) = EDD

**Can the due date change?**

Yes, there might be a change in the due date; there may be several reasons to change your pregnancy due date as your pregnancy progresses.

It is due to irregular periods, your early ultrasound dating was off, or that ultrasound is in the second trimester. The changes will be because fundal height is abnormal; your alpha-fetoprotein levels, a protein made by the baby, are outside the usual range.

** Methods to determine due date!**

Use an online calculator.

Choose your due date calculator.

There are several ways to calculate your due date; each site's calculator has different features that may or may not appeal to you, such as different ways to calculate your due date and optional reports.

Enter the date of your last period or conception date

Most calculators can provide an estimated due date on your last period or when you conceived your baby.

Confirm the date with your doctor.

A Due Date Calculator is a great way to estimate your due date early in your pregnancy.

**Counting the weeks manually**

Determine the date of the first day of your last period

Count forty weeks from the date of your last period

Use Naegele’s rule as an alternative

Talk to your doctor if you have an irregular period

**Using an ultrasound**

- Make an appointment with your doctor
- Ask for an ultrasound during weeks eight to eighteen
- Wear loose, two-piece clothing that is easy to remove
- Expect to remove all clothing for a transvaginal ultrasound
- Drink enough water to fill your bladder
- Tell the doctor the date of your last period