Pregnancy Due Date Calculator: Estimate Your Baby's Arrival.

Calculation Method First Day of Last Period (LMP) Known Date of Conception

Select Date

Average Cycle Length (Days)

Average is 28 days.

Estimated Due Date

Select a Date

Only 5% of babies are born on their exact due date!

Current Progress

-- Weeks

Current Trimester

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Free Pregnancy Due Date Calculator

Welcome to the Pregnancy Due Date Calculator by CalcHub Pro. Whether you just saw a positive test or are planning ahead, finding out when your baby is due is the most exciting first step of the journey. Use our free tool to instantly calculate your estimated due date (EDD), track your current week of pregnancy, and see what trimester you are in.

How We Calculate Your Due Date

Pregnancy math can be confusing because it doesn't actually start on the day you conceive! Here are the two standard methods our medical-grade calculator uses:

• Last Menstrual Period (LMP): This is the method most doctors use. Pregnancy is measured as lasting 40 weeks (280 days) from the first day of your last period. Our tool also adjusts this date if your average cycle is shorter or longer than the standard 28 days.
• Date of Conception: If you were tracking ovulation or underwent IVF, you might know the exact date of conception. In this case, we simply add 38 weeks (266 days) to that date.

Understanding Trimesters

A full-term pregnancy is divided into three trimesters, each marking major developmental milestones for your baby:

• First Trimester (Weeks 1-12): The most crucial stage of development where the baby's organs begin to form.
• Second Trimester (Weeks 13-26): Often called the "honeymoon phase" of pregnancy. Morning sickness usually fades, and you may begin to feel the baby move.
• Third Trimester (Weeks 27-40+): The final stretch where the baby gains weight rapidly and prepares for birth.

Frequently Asked Questions (FAQ)

Will my baby actually be born on my due date?
Probably not! A due date is simply an estimate to guide your doctor. Only about 4% to 5% of babies arrive on their exact predicted date. It is perfectly normal for a baby to be born anywhere between 37 and 41 weeks.