Calculate your estimated due date from your last period, conception date, IVF transfer, or ultrasound, and track weekly pregnancy milestones.
Calculate your baby's due date to map your progress, unlock trimesters, personalize milestones, and view your custom prenatal calendar.
Every pregnancy is a beautiful, unique adventure. Here is a custom guide to help you follow your body's amazing milestones and trace your little one's growth week-by-week.
Estimated Conception: Jan 22, 2026
Standard pregnancy is calculated at 40 weeks (280 days).
Note: Calculations are based on clinical averages. Due dates are estimates; only about 4% of babies are born on their exact due date.
This tool is for educational purposes only and provides estimated dates based on average timelines. The results are not medical advice and should not be used as a substitute for professional diagnosis, counsel, or care by an obstetrician-gynecologist (OB-GYN), certified midwife, or medical provider. Normal pregnancies can vary by up to two weeks in either direction.
Understanding gestational calculations, clinical trimesters, and essential guidelines for healthy progression.
Clinically, pregnancy is dated starting from the first day of your Last Menstrual Period (LMP). This means that during the first two weeks of your "gestational age," you are not actually pregnant yet; your body is preparing for ovulation. Due date models (like Naegele's Rule) add 280 days from this LMP base date to approximate a full 40-week term.
Pregnancy is split into three phases. **First Trimester (Weeks 1-13)** is the period of rapid organogenesis, where the basic structures are formed. **Second Trimester (Weeks 14-27)**, often called the "golden phase," brings increased energy and visible baby movements. **Third Trimester (Weeks 28-40+)** focuses on rapid baby growth, lung maturation, and labor preparation.
Getting regular checkups is vital. Early in pregnancy, focus on daily prenatal vitamins containing Folic Acid (400–800 mcg) to help prevent neural tube defects. Monitor hydration, eat nutrient-dense meals, and check in with your provider before starting new exercise regimens. Between weeks 18 and 22, the crucial anatomy ultrasound scan monitors major organs.
The default method adds 280 days (40 weeks) to the first day of your last menstrual period, then adjusts for cycles that are not exactly 28 days by adding or subtracting the difference. This adjustment matters because a longer or shorter cycle shifts the actual ovulation day away from the standard Day 14 assumption.
If you know your conception date, the calculator adds 266 days (38 weeks) instead. For IVF pregnancies, it adds 263 days to a 3-day embryo transfer date or 261 days to a 5-day blastocyst transfer date. For ultrasound dating, it works backward from the scan date using the measured gestational age to project the same 280-day total.
For a last menstrual period starting January 1 with a 30-day cycle, the due date is January 1 plus 280 days plus 2 extra days for the longer-than-average cycle, landing around October 10. A standard 28-day cycle with the same LMP date would land two days earlier, around October 8.
Because due dates are estimates, only a small share of babies are born exactly on the calculated date, and doctors will typically favor an early ultrasound measurement over LMP dates if the two differ by more than about a week. Track how far along you are with the Pregnancy Weight Gain Calculator, and use the Ovulation & Fertility Calculator when planning future pregnancies.
Quick answers about how this tool works.
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