Pregnancy Calculator
Find your estimated due date, current pregnancy week, and trimester in seconds. Choose your last period date or conception date below to get started free, private, and accurate.
Pregnancy Calculator: Estimate Your Due Date & Track Your Pregnancy Week by Week
Not sure when your baby will be born? Try using our free Pregnancy Calculator to get your due date, see your current week of pregnancy, know about each trimester milestones, and more based on your LMP, conception date or ultrasound.
Using the Pregnancy Calculator
The length of pregnancy is considered to be 40 weeks (280 days) from the first day of your last normal period (LMP), which is when you believe you became pregnant, rather than the day you actually do. Doctors and midwives in the world use this method, called Naegele’s Rule.
You can calculate your due date using any of these methods:
- Last Menstrual Period (LMP): The most common method — add 280 days to the first day of your last period.
- Conception Date: If you know your conception date, your due date falls approximately 266 days later.
- Ultrasound Date: Your doctor may adjust your due date based on fetal measurements taken during an early ultrasound, which can be more accurate for people with irregular cycles.
- IVF Transfer Date: For IVF pregnancies, the due date is calculated from the embryo transfer date and the embryo’s age (day 3, 5, or 6) at transfer.
Pregnancy Due Date: How Accurate Is It?
It is crucial to do the following; set realistic expectations: A due date is an estimate, not a certainty. Studies indicate that only a small number of babies are born on their “due date,” with the majority coming in within two or three weeks.
A normal pregnancy is normally 37-42 weeks, so there is some natural variation allowed.
Trimester Breakdown
|
Trimester |
Weeks |
What’s Happening |
|
First Trimester |
Weeks 1–12 |
Major organ development begins; morning sickness and fatigue are common |
|
Second Trimester |
Weeks 13–27 |
Often called the “golden period”; energy returns, baby bump becomes visible |
|
Third Trimester |
Weeks 28–40 |
Rapid weight gain, baby positions for birth, Braxton Hicks contractions may start |
Signs of Pregnancy to Watch For
Many people experience early signs like headaches, nausea, breast tenderness, fatigue and frequent urination before a positive test. You can receive a “home” pregnancy test that will show pregnancy hormone, or hCG, within 1 to 10 days of a missed period.
A blood test at a clinic will be able to let you know if you are pregnant a little earlier.
Tips for a Healthy Pregnancy
- Nutrition: Prioritize folic acid, iron, calcium, and DHA-rich foods to support fetal development.
- Exercise: Light to moderate activity, such as walking or prenatal yoga, is generally safe and encouraged unless your doctor advises otherwise.
- Prenatal Care: Regular checkups allow your doctor to track growth, catch complications early, and confirm or adjust your due date via ultrasound.
- Medication Safety: Always consult your doctor before taking any medication, supplement, or herbal remedy during pregnancy.
Frequently Asked Questions
How is my due date calculated if I have irregular periods?
With irregular cycles, it is more accurate to get a due date estimate from an early ultrasound (usually performed between 8-12 weeks), instead of the due date calculation from your last period.
Can my due date change during pregnancy?
Yes. The due date may be adjusted after an early ultrasound if the fetus’ measurements indicate a different gestational age than was originally estimated.
How many weeks is a full-term pregnancy?
Full term is between 39 and 40 weeks, but it can be anywhere between 37 and 42 weeks that a pregnancy is considered full term.
Does the calculator work for IVF pregnancies?
Yes, just click on IVF and complete your embryo transfer date and the age of embryo at transfer (day 3, 5 or 6) for an accurate estimate.
Is this calculator a substitute for medical advice?
No. This is an estimated tool for information purposes only. Always talk to your OB/GYN or midwife for individual medical advice during pregnancy.