Calculate your due date and conception date using Naegele's rule. Enter your last menstrual period or due date to get a complete pregnancy timeline with weeks, trimesters, and key milestones. Free and private.
A pregnancy calculator estimates your due date and tracks important milestones throughout your pregnancy journey. Whether you've just discovered you're expecting or you're planning ahead, this calculator helps you understand where you are in your pregnancy and what to expect in the coming weeks.
Pregnancy is typically calculated as 40 weeks (280 days) from the first day of your last menstrual period (LMP), not from the date of conception. This is because the exact date of conception is often unknown, but most women can recall when their last period started. The calculator also shows your current trimester, weeks pregnant, and key developmental milestones for your baby.
If your last menstrual period started on March 1, 2025, your estimated due date is December 5, 2025 (March 1 + 280 days). On June 1, 2025, you would be approximately 13 weeks pregnant, entering your second trimester. Your conception likely occurred around March 15, 2025.