Pregnancy Calculator

Track your progress: Calculate your gestational age and estimated due date (EDD) instantly.

When was the first day of your LMP?

Gestational Results
Current Gestational Age --
Last Menstrual Period (LMP) --
Estimated Conception Date --
Estimated Due Date (EDD) --
Medical Disclaimer: This pregnancy weeks calculator is for informational purposes only. Always consult a healthcare professional for clinical advice.

How does this tool work?

  • Enter last menstrual period (LMP) or due date: Provide a known date to base calculations on.
  • Calculate current gestational age: The tool computes weeks and days since LMP (or until due date).
  • View trimester: Automatically determine which trimester (1st, 2nd, 3rd) based on weeks.
  • See estimated milestones: Key dates like conception, fetal viability, and full term.
  • Adjust if needed: You can recalculate with different input dates.

Gestational age counting starts from the first day of the last menstrual period (LMP). A typical pregnancy lasts 40 weeks from LMP (or 38 weeks from conception). This calculator helps expectant parents track pregnancy stage and anticipate important milestones.

Track Your Pregnancy with Accuracy and Confidence

The Pregnancy Due Date Calculator by ToolBurst is an essential tool for expectant mothers to monitor every stage of fetal development. Using Naegele's Rule — the gold standard in obstetrics — our system converts your Last Menstrual Period (LMP) into detailed information about your pregnancy’s progress.

Beyond discovering exactly which week and day you are in, you will get your Estimated Due Date (EDD). This allows for much smoother planning for your baby's arrival, organizing the nursery, and scheduling fundamental prenatal exams.

Understanding gestational age is also crucial for your professional life. For working women, this information is the starting point for understanding job security rights and planning maternity leave with your company's HR department.

Close-up of a pregnant woman holding her belly next to a baby shoes or a calendar marking the expected due date

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Frequently Asked Questions

Most pregnancies last around 40 weeks (280 days) from the first day of the last menstrual period. Our due date calculator uses this standard biological rule to estimate your baby's birth date and current gestational age.

If you're unsure of your last period date, an ultrasound scan is the most accurate way to determine gestational age. Once you have the weeks from your doctor, you can use our tracking tools to monitor your progress.

The first trimester runs from week 1 to 12, the second from week 13 to 26, and the third trimester starts at week 27 and lasts until birth (usually around 40 weeks).

The due date is just an estimate. Only about 5% of babies are born on their exact date. Most are born within a two-week window before or after the predicted day.

Gestational age is calculated from your last period, while fetal age (conception age) is the actual age of the developing baby, which is typically two weeks less than the gestational age.

Yes. If you know your conception date, you can add 266 days (38 weeks) to find your estimated due date, as opposed to the 280 days used when starting from the last period.

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