Best when your test just turned positive
A quick estimate helps you understand where you may be in pregnancy before your first visit is on the calendar.
Parenting calculators
Use these pages when you need a quick estimate, a planning date, or a clearer next step. They are built for everyday parent questions, not diagnosis or treatment. When symptoms, missed vaccines, feeding concerns, or growth worries are involved, use your pediatrician's advice as the final guide.
Pregnancy timeline
Due Date Calculator
Use your last menstrual period and average cycle length to estimate your due date, current week of pregnancy, and the milestones parents commonly plan around in the US.
Helpful next step
Once your due date looks right, save your first prenatal visit and anatomy scan window. You can later use the baby age calculator for newborn milestones.
Enter the first day of your last menstrual period to estimate your due date and current pregnancy week.
How parents usually use a due date calculator
A due date estimate helps with more than curiosity. It gives you a simple anchor point for scheduling a first prenatal visit, understanding what pregnancy week you are in, and planning around scans, leave, travel, and baby prep. Most calculators start with the first day of your last menstrual period because that is still the most common early reference point before dating is confirmed.
Ultrasound dating can shift the final date your OB office uses, especially when cycle length is irregular or ovulation happened earlier or later than average. That is why this tool works best as a first estimate and a planning guide rather than a medical confirmation.
Useful for appointment planning
Parents often use the estimate to think about the first prenatal appointment, anatomy scan timing, and big month-by-month milestones.
Good for family logistics
It can also make work leave planning, childcare planning, and support conversations much easier because everyone has a rough timeline to work from.