Want to know you Due Date?
Planning for a little one? A pregnancy calculator—also known as a due date calculator—can help you discover your estimated due date in just a few clicks. It’s one of the most searched pregnancy tools online, and for good reason!
pregnancy calculator estimates when your baby is likely to arrive. You simply enter a date—like the first day of your last menstrual period (LMP), conception date, IVF transfer date, or ultrasound date—and the calculator does the math for you.
You’ll often find options to calculate using different starting points like:
LMP (Last Menstrual Period)
Conception Date
IVF Transfer Date
Ultrasound Date
Estimate your due date easily
LMP method: The most common way—add 280 days (or 40 weeks) to your LMP to get an estimated due date. However, it assumes a 28-day cycle, so adjustments may be needed for shorter or longer cycles.
Conception date: If you know when conception occurred (tracked via ovulation or fertility tools), add about 266 days (38 weeks) to find your due date—this is often more accurate for those tracking closely.
IVF method: For IVF, calculators tailor the due date based on the embryo transfer date. For example, add about 263 days for a Day-3 embryo or 261 days for a Day-5 embryo.
cycles are irregular
Even with these methods, only about 4% of babies arrive on the exact due date. Most are born within a week or two before or after that estimated day. Factors like cycle length, ovulation timing, and individual variations in fetal development all play a part.
Conception calculator: Plan ahead by estimating the conception date or calculating backwards from a desired due date.
Track pregnancy symptoms: Once you input a due date, many calculators also map out what symptoms or milestones you might expect early or at 2 months and 3 months pregnant .
Prenatal vitamin reminders: Some tools include tips for when to start or which prenatal vitamins to consider.
Standard, general
More precise
Highly accurate
Most accurate method
A pregnancy calculator is a simple, user-friendly way to get a ballpark idea of when your baby’s arrival might be. It’s not a crystal ball, but it’s a powerful tool that, combined with medical advice and ultrasound guidance, helps you prepare emotionally and practically for the exciting journey ahead.
