Pregnancy Calculator

Estimate your due date and track your pregnancy milestones using various input methods.

Select your calculation method:

LMP Date Conception Date Due Date IVF Transfer Date

Last Menstrual Period (LMP) Date

Average Cycle Length (days)

Date of Conception

Estimated Due Date

IVF Transfer Date

Embryo Age

Your Pregnancy Overview

To Go…

— days

— weeks

You are…

— weeks

— days pregnant

Estimated Due Date

–/–/—-

Current Trimester

—

Approx. LMP Date

–/–/—-

Approx. Conception Date

–/–/—-

Your baby is as big as:

—

At — weeks you might be…

Key Milestones

Understanding Your Pregnancy Journey:

A typical full-term pregnancy lasts approximately 280 days (40 weeks) from the first day of your Last Menstrual Period (LMP), or 266 days (38 weeks) from the date of conception. This calculator provides estimates based on these common calculation methods.

Trimesters Breakdown:

First Trimester: Weeks 1 to 13
Second Trimester: Weeks 14 to 27
Third Trimester: Weeks 28 to 40 (until delivery)

Important Note: Pregnancy dates are always estimates. Your healthcare provider will confirm your due date with ultrasound and other assessments. This calculator is for informational purposes only and should not replace professional medical advice.

Introduction

The moment you see a positive test, one question burns brighter than all others: "When is my baby due?" Our Pregnancy Calculator (also known as a Due Date Calculator) provides an accurate Estimated Due Date (EDD) and unlocks a personalized week-by-week guide to your baby's development. Understand your pregnancy timeline and what to expect every step of the way.

( Curious about your chances of conceiving? Use our Fertility By Age Calculator to understand your odds.)

How to Use the Pregnancy Calculator

Getting your due date is simple. Choose your calculation method:

Last Menstrual Period (LMP) Method: The most common clinical standard. Enter the first day of your last period.
Conception Date Method: If you know the exact date of conception, you can use this for a secondary estimate.

How it works: The calculator uses the Naegele's Rule: LMP + 280 days (40 weeks). This estimates your due date, but remember, only about 5% of babies are born exactly on their EDD!

To track your cycles and pinpoint ovulation for future planning, a basal body temperature (BBT) thermometer like the Femometer Vincenzo II is incredibly accurate.

Understanding Your Pregnancy Timeline: Trimesters Explained

Your 40-week journey is divided into three trimesters, each with unique milestones.

Trimester	Weeks	Key Developments
First	1-13	Positive test, embryo formation, major organs begin to develop. Morning sickness often peaks.
Second	14-27	"Golden period." Baby's movements begin, gender can often be detected. Energy usually returns.
Third	28-40+	Rapid growth, baby gains fat, organs mature. Final preparations for birth.

Pro Tip: *Your due date is an estimate. A full-term pregnancy is between 39 weeks 0 days and 40 weeks 6 days.*

What to Do After You Calculate Your Due Date

Your due date is your roadmap for the next nine months.

Schedule Your First Prenatal Appointment: Call your healthcare provider to confirm your pregnancy and get official clinical guidance.
Start a Prenatal Vitamin: If you haven't already, begin taking one immediately. 🔗 Affiliate Suggestion: Ritual Essential Prenatal is a popular, high-quality, clean-ingredient option delivered to your door.
Download a Pregnancy App: Sync your due date with an app to get daily updates on your baby's size and development.
Consider a Pregnancy Journal: A beautifully designed journal like the Promptly Pregnancy Journal helps you document this special time.

( To understand how your body will change, use our Pregnancy Weight Gain Calculator for a healthy target range.)

Beyond the Due Date: Other Key Pregnancy Calculators

Your due date is just the beginning. Our suite of tools helps you navigate your entire journey:

Ovulation Calculator: Plan for your next pregnancy or understand how you conceived.
Conception Date Calculator: Pinpoint when your baby was likely conceived.
Chances of Having Twins Calculator: Explore the factors that increase your odds of a multiple birth.
Breastfeeding Calorie Calculator: Prepare for postpartum nutrition needs.

Common Questions About Due Dates

Q: My ultrasound due date is different from my LMP date. Which one is right?

A: This is very common. Early first-trimester ultrasounds (especially dating scans between 8-13 weeks) are considered the most accurate for establishing an EDD. Your doctor will typically use the date from the earliest ultrasound.

Q: What if I have irregular periods?

A: The LMP method is less accurate if your cycles are irregular. An early dating ultrasound is highly recommended to establish a reliable due date.

Q: I know when I ovulated. How does that change my due date?

A: If you ovulated later than day 14 of your cycle, your pregnancy may be less far along than the LMP method suggests. Our calculator can account for this if you use the conception date method.

Essential Products for Your First Trimester

The right tools can make early pregnancy more comfortable.

For Morning Sickness: Sea-Bands use acupressure to combat nausea without medication.
For Hydration: A large motivational water bottle helps you meet increased fluid needs.
For Sleep: A pregnancy body pillow like the Boppy Pregnancy Wedge provides support long before a bump appears.
For Reading: The book What to Expect When You're Expecting is a classic, comprehensive guide.

Next Steps on Your Pregnancy Journey

Confirm with a Doctor: Always follow up with healthcare professionals.
Educate Yourself: Read about prenatal nutrition and birth options.
Build Your Support System: Connect with other expectant parents online or in local groups.

As you prepare for the baby's arrival, creating a registry on Amazon or Babylist allows you to easily manage gift preferences from multiple stores.

Pregnancy Calculator