The pregnancy week and due date calculator estimates the current gestational age, due date, days pregnant and days remaining until the due date based on the first day of the last menstrual period or the due date, and provides reference information about fetal development for the current pregnancy week.
The tool can help users understand whether they are in early, middle or late pregnancy and view pregnancy progress and fetal development references for the corresponding week.
Enter the first day of the last menstrual period. The tool estimates the due date from this date and calculates the current pregnancy week, days pregnant and days remaining until the due date based on the current date.
The due date is estimated by adding 280 days, or 40 weeks, to the first day of the last menstrual period.
Enter the estimated due date to estimate pregnancy-related dates in reverse and view the corresponding pregnancy week and pregnancy progress.
A commonly used method estimates the due date by counting 280 days, or 40 weeks, from the first day of the last menstrual period. The tool uses this method to estimate the due date.
The first day of the last menstrual period is an important reference date for calculating pregnancy week and due date. Entering an accurate date provides the corresponding estimated due date and current pregnancy week.
The due date is an estimated date based on information such as the last menstrual period and does not represent the actual delivery date. Delivery may occur earlier or later, and the actual situation should be assessed together with prenatal examination results and professional medical advice.
After calculation, you can view the current pregnancy week, pregnancy stage, pregnancy progress, last menstrual period, due date, days pregnant and days remaining until the due date.
Pregnancy is commonly expressed as completed weeks plus remaining days, such as “30+0”, meaning 30 complete weeks. Pregnancy week is an important time indicator for prenatal care and describing fetal development stages.
Days pregnant are estimated from the difference between the first day of the last menstrual period and the current date, providing a simple view of the elapsed pregnancy time.
This indicates the number of days remaining between the calculation date and the estimated due date.
Pregnancy progress uses 40 weeks as the reference full-term period and calculates the proportion completed based on the current pregnancy week. For example, at 30 weeks, progress is approximately 75%.
Early pregnancy generally refers to the first stage of pregnancy and is an important period of embryonic development. Specific pregnancy stages should follow professional medical assessment and prenatal care schedules.
Middle pregnancy is an important period of continued fetal growth and development. The corresponding fetal development can be considered together with pregnancy week and prenatal examinations should follow medical advice.
Late pregnancy is the later stage of pregnancy, when fetal weight and body systems continue developing in preparation for birth. The tool displays the corresponding pregnancy stage according to the current pregnancy week.
The tool provides fetal development reference information based on the current pregnancy week. For example, during weeks 29 to 32, the fetus generally continues gaining weight and fetal position may gradually change.
Weeks 29–32 are part of late pregnancy. Fetal weight generally increases progressively and fetal position may become more stable. Actual fetal size, position and development should be professionally assessed through prenatal examinations.
Choose calculation from the last menstrual period or from the due date according to the information available.
Enter the last menstrual period date or estimated due date according to the selected calculation method.
After entering the date, view the current pregnancy week and corresponding pregnancy stage.
The tool displays the estimated due date, days pregnant and days remaining until the due date.
View fetal development reference information corresponding to the current pregnancy week.
The commonly used method starts from the first day of the last menstrual period rather than the actual conception date.
The tool estimates the due date by adding 280 days, or 40 weeks, to the first day of the last menstrual period.
No. The due date is an estimate, and the actual delivery date may differ. The due date in this tool is mainly for pregnancy timeline reference.
Clinical gestational age is usually calculated from the first day of the last menstrual period, so pregnancy week is not calculated solely from conception. Actual ovulation and conception dates can vary between individuals.
“30+0” means 30 complete weeks of pregnancy with no additional days. “30+3” means 30 completed weeks plus 3 additional days.
The relationship between a 40-week pregnancy and the estimated due date can be used to estimate the corresponding date. The tool supports pregnancy calculations based on the due date, but the actual last menstrual period should primarily be based on personal menstrual records.
Pregnancy progress is calculated as a proportion using 40 weeks as the reference period. 75% means approximately three quarters of the reference pregnancy period has been completed according to the current pregnancy week.
No. The fetal development information is provided only as a reference corresponding to pregnancy week and cannot replace ultrasound examinations, prenatal care or professional assessment of actual fetal development.
This tool estimates pregnancy week and due date from entered dates. Results are for pregnancy timeline reference only. Actual due date, fetal development and delivery timing may vary between individuals. Pregnancy-related questions should be considered together with prenatal examination results and the advice of a doctor or professional medical institution.
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