Pregnancy Due Date Calculator
Estimate your baby's due date based on your last menstrual period.
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Calculate Your Pregnancy Due Date & Timeline
Our Pregnancy Due Date Calculator provides an estimated due date based on your last menstrual period, conception date, or IVF transfer. It also tracks your progress and key milestones.
What is a Due Date Calculator?
A Pregnancy Due Date Calculator is a tool that estimates the date your baby will be born. While it's called a "due date," it's more accurately a "due window," as very few babies are born on their exact calculated date. This calculator provides this estimate using several standard methods and also gives you valuable information about your pregnancy timeline, such as how far along you are, your current trimester, and key developmental milestones.
How It Works: Different Calculation Methods
Our calculator supports several methods:
- Last Menstrual Period (LMP): This is the most common method. It adds 280 days (40 weeks) to the first day of your last period.
- Conception Date: If you know the date of conception, the calculator adds 266 days (38 weeks) to find your due date.
- IVF Transfer Date: Based on whether you had a 3-day or 5-day embryo transfer, it calculates the due date from the transfer date.
- Ultrasound: If you have an early ultrasound, your doctor may provide a due date which you can use to calculate your timeline.
Interpreting Your Pregnancy Timeline
The main result is your **Estimated Due Date**. Beyond that, the calculator shows your **Gestational Age** (how many weeks and days pregnant you are), which trimester you're in, and fun facts like what fruit or vegetable your baby is currently the size of. This provides a comprehensive and engaging overview of your pregnancy journey.
Frequently Asked Questions
How is pregnancy due date calculated?
The most common way to calculate a pregnancy due date is Naegele's rule, which adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). Our calculator uses this method and can also calculate from conception date, IVF transfer date, or an existing due date.
How accurate is a due date calculator?
A due date calculator provides a very good estimate, but only about 5% of babies are born on their exact due date. It's best to think of your due date as the center of a two-week period during which you are likely to give birth.
What is considered full term in a pregnancy?
A full-term pregnancy is one that lasts between 39 weeks, 0 days and 40 weeks, 6 days. Babies born during this window have the best chance of being healthy.
How many weeks pregnant am I?
Our calculator determines how many weeks and days pregnant you are (your gestational age) by counting the number of days between the first day of your last period and today's date.
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