Calculate Your Due Date
Pregnancy Timeline
A Pregnancy Calculator is a vital tool for expectant mothers to track their pregnancy journey. It accurately estimates your baby's due date, calculates your current gestational age in weeks and days, and outlines which trimester you are currently experiencing. Knowing your due date helps you and your healthcare provider schedule important prenatal checkups and prepare for your baby's arrival.
How the Due Date is Calculated
The standard medical method for calculating an Estimated Due Date (EDD) is based on Naegele's rule. A typical pregnancy lasts about 280 days (40 weeks) from the first day of your Last Menstrual Period (LMP). If you know the exact day you conceived, the calculation adjusts to add 266 days (38 weeks) to the conception date.
Because every woman's body is different, our tool allows you to adjust your average cycle length. If your cycle is longer or shorter than the standard 28 days, the calculator will automatically shift your due date to provide a much more accurate estimation.
How to Use This Calculator
- Select your preferred calculation method: First Day of Last Period (LMP) or Exact Date of Conception.
- Enter the specific date using the calendar input field.
- If calculating by LMP, input your average menstrual cycle length in days. The default is 28 days.
- View your Estimated Due Date displayed clearly in the main dashboard.
- Check your current gestational age to see exactly how many weeks and days pregnant you are today.
- Monitor your progress through the trimesters using the visual timeline bar.
Frequently Asked Questions
How accurate is the estimated due date?
An estimated due date is exactly that—an estimate. Only about 5 percent of babies are actually born on their exact due date. Most women deliver healthy babies within a two-week window before or after their calculated due date. Your doctor may also adjust this date later based on ultrasound measurements.
What are the pregnancy trimesters?
Pregnancy is divided into three distinct trimesters to track the baby's development. The First Trimester runs from week 1 to the end of week 13. The Second Trimester covers week 14 through week 27. The Third Trimester spans from week 28 until birth. A pregnancy is considered "full term" once it reaches 37 weeks.
Can I use this if I have irregular periods?
If your periods are highly irregular, calculating by LMP might be less accurate because ovulation dates vary. In these cases, an early ultrasound performed by your healthcare provider is the most reliable way to determine your true gestational age and due date. You can then use that date to track your ongoing progress.