🤰 Pregnancy Due Date Calculator

Estimate your due date and track your pregnancy

Last Menstrual Period (LMP)

Conception Date

IVF Transfer Date

Ultrasound Date

First Day of Last Period

Conception Date

IVF Transfer Date

Embryo Type

Ultrasound Date

Weeks at Ultrasound

Days

Estimated Due Date

Current Week

days until due date

Estimated Conception

Trimester

First Trimester

Second Trimester

Third Trimester

📅 Pregnancy Milestones

Frequently Asked Questions

How is the due date calculated?

The due date is typically calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14.

How accurate is the due date?

Only about 4% of babies are born on their exact due date. Most babies (about 80%) are born between 38 and 42 weeks. The due date is an estimate, not a guarantee.

What if I conceived through IVF?

For IVF pregnancies, the due date is calculated from the transfer date. For Day 3 embryos, add 263 days. For Day 5 embryos (blastocysts), add 261 days.

Why does my ultrasound due date differ from LMP?

Ultrasound measurements in the first trimester are often more accurate than LMP calculations, especially if you have irregular cycles or are unsure of your LMP date.

What are the three trimesters?

First trimester: Weeks 1-12. Second trimester: Weeks 13-26. Third trimester: Weeks 27-40. Each trimester has different developmental milestones.