Estimate your due date, current gestational week, trimester, and key milestones from the most reliable pregnancy date you have.
Use the most reliable date available to you.
How to use this tool, plus the formulas and logic behind the results.
The Pregnancy Calculator estimates due date, gestational age, and trimester timing from your dating method and dates entered.
Common LMP method: due date ≈ LMP + 280 days (Naegele-style estimate)Gestational age = days since LMP (or method-specific start)Trimesters divide pregnancy into standard week rangesDates are advanced or counted using the selected clinical dating approach. Ultrasound or IVF dating may differ from calendar estimates.
A Pregnancy Calculator is an online tool that estimates important pregnancy dates, including your estimated due date, current pregnancy week, and trimester. It usually calculates these dates based on the first day of your last menstrual period (LMP) or the estimated conception date. While it provides a helpful estimate, only a healthcare provider can confirm pregnancy dates through medical evaluation.
Most Pregnancy Calculators use the first day of your last menstrual period (LMP) to estimate your due date. A typical pregnancy lasts about 40 weeks, or 280 days, from the first day of the last period. The calculator counts forward based on this standard timeline to estimate your baby's expected delivery date.
A Pregnancy Calculator provides an estimate rather than an exact prediction. Many babies are not born on their exact due date, and normal deliveries can happen several weeks before or after the estimated date. Factors such as irregular menstrual cycles, ovulation timing, and individual pregnancy differences can affect accuracy.
The estimated due date is usually calculated by adding 280 days (40 weeks) to the first day of your last menstrual period. This method is based on the assumption of a regular 28-day menstrual cycle. If your cycle length differs or you know your conception date, the estimate may be adjusted.
Pregnancy weeks are typically counted from the first day of your last menstrual period, not from the day of conception. This means pregnancy is counted from approximately two weeks before conception occurs. A Pregnancy Calculator can estimate your current pregnancy week based on your last menstrual period or due date.
Your estimated due date is the date when your baby is expected to reach approximately 40 weeks of pregnancy. Only a small percentage of babies are born exactly on their due date. Most births occur within a normal range around the estimated date.
Pregnancy is divided into three trimesters:
Each trimester represents different stages of your baby's growth and changes in your body.
Yes, but the estimate may be less accurate. If you know your approximate conception date, the calculator can use that information instead. Healthcare providers may also use ultrasound measurements to estimate pregnancy dates more accurately.
Pregnancy is medically counted from the first day of your last menstrual period, even though conception usually happens about two weeks later. This counting method provides a consistent starting point because the exact day of conception is often difficult to determine.
A full-term pregnancy is generally considered to be about 40 weeks. However, healthy births can happen within a broader range. Healthcare professionals commonly describe pregnancy stages as early term, full term, late term, and post term based on the number of completed weeks.
No. A Pregnancy Calculator cannot determine a baby's gender. It is designed to estimate pregnancy dates and milestones. The baby's sex can usually be determined through medical tests such as ultrasound or genetic screening performed during pregnancy.
Yes, but the result may be less accurate because standard calculations assume a regular menstrual cycle. If your periods are irregular, an ultrasound performed by a healthcare professional may provide a more reliable estimate of your pregnancy timeline.
Gestational age is the medical method used to measure pregnancy from the first day of your last menstrual period. Fetal age refers to the actual time since conception, which is usually about two weeks shorter than gestational age. Doctors typically use gestational age when discussing pregnancy progress.
No. A Pregnancy Calculator can only provide an estimated due date. The actual delivery date depends on many factors, including the baby's development, maternal health, and the natural timing of labor. The due date is a helpful reference point, not a guaranteed delivery date.
After confirming a pregnancy, it is recommended to schedule an appointment with a healthcare provider for proper prenatal care. Regular checkups help monitor your health, track your baby's development, and provide guidance throughout pregnancy.