Pregnancy Due Date Calculator

Calculate Your Estimated Due Date

Choose the method that best matches the information you have. This calculator gives an estimate only and should not replace antenatal care or clinical ultrasound dating.

Calculation Method

First Day of Last Menstrual Period

Average Cycle Length

Important: This tool provides an estimate. Your healthcare provider may adjust your due date after ultrasound scans, clinical review, or menstrual history assessment.

How the Pregnancy Due Date Calculator Works

Pregnancy due dates are commonly estimated by adding 280 days, or 40 weeks, to the first day of the last menstrual period. This method assumes a 28-day menstrual cycle and ovulation around day 14. If your cycle is longer or shorter, your estimated due date may shift slightly.

The calculator also supports conception date and IVF transfer date options. These options are useful when you know the estimated conception day or when pregnancy occurred through assisted reproduction. IVF dating is usually more precise because the embryo transfer date is documented.

Even with a calculator, due dates remain estimates. Many babies are born before or after the calculated date. Antenatal visits, ultrasound scans, fetal growth checks and professional medical guidance remain the best way to monitor pregnancy progress.

Pregnancy Milestones Timeline

Week 4

Pregnancy test may become positive around the time your period is missed.

Week 8

Early development is active and many women schedule first antenatal visits around this period.

Week 12

The first trimester is nearing completion and early screening may be discussed.

Week 20

Many patients have an anatomy scan around this stage depending on healthcare guidance.

Week 28

The third trimester begins, and monitoring usually becomes more frequent.

Week 40

This is the estimated due date, although normal delivery may happen before or after this date.

Pregnancy Planning and Tracking Tips

Once you have an estimated due date, use it as a guide for antenatal planning, nutrition, supplements, pregnancy-safe medicines, maternity shopping and hospital preparation. Keep a record of your last period, test results, scan reports and any symptoms you discuss with your healthcare provider.

For women trying to conceive, combining this page with MeddyLab’s ovulation checker can help estimate fertile days. For confirmed pregnancy, due date tracking can help you understand the trimester, expected milestones and when to prepare for important scans or appointments.