Pregnancy Weeks Calculator and Due Date Estimator

Use this pregnancy weeks calculator to estimate gestational age, current trimester and due date based on the first day of the last menstrual period. It gives you a quick way to follow the pregnancy in weeks and days, compare appointment timelines and get an initial view of the overall schedule.

Beyond the estimated due date, the tool also shows an estimated conception date, the approximate pregnancy month and how many days remain until the projected date. You can adjust the average cycle length when your cycle is shorter or longer than the typical 28 days.

The result is meant as an informational reference and should not replace medical evaluation. If you need confirmation about gestational age, ultrasound dating, preterm birth risk or cycle differences, review the estimate with your healthcare professional.