As each pregnancy differs, any dates, weights, and lengths should be considered general information for interest only. Our week-by-week guides use both standard and metric units of measure including pounds and kilograms. Please enter your due date. First day of your last period. Find my Due Date. Example: If your last menstrual period started on a Wednesday, count one week to the next Wednesday. Now keep counting Wednesdays until you reach the present date. References Committee Opinion No.
Method for estimating due date. Obstet Gynec. Jukic et al. Length of human pregnancy and contributors to its natural variation. Registry Builder New. Due Date Calculator When is your baby due? Use this pregnancy calculator to find your due date based on the date of your last menstrual period, conception date, IVF 3-day or 5-day transfer date or date of your last ultrasound.
Calculation Method. The first day of your last period. Date of Conception. Date of Transfer. Date of Ultrasound.
Medically Reviewed by Aaron Styer, M. Medical Review Policy All What to Expect content that addresses health or safety is medically reviewed by a team of vetted health professionals.
How to Calculate Your Due Date. First day of last period Most pregnancies last around 40 weeks or 38 weeks from conception , so typically the best way to estimate your due date is to count 40 weeks, or days, from the first day of your last menstrual period LMP. Conception date Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle. IVF transfer date There are more than , assisted reproductive technology cycles performed each year in the United States, resulting in about 77, or more babies born a year, according to the Centers for Disease Control and Prevention CDC.
The size of your uterus, which will be noted when your initial internal pregnancy exam is performed, can also be a factor in pinpointing the EDD. This is known as gestational dating. Our how many months am I calculator uses your due date to calculate how many calendar months and days you are pregnant. Please note: on this site, all references to months are to Gregorian calendar months. Traditionally obstetricians counted pregnancy in months that were 4 weeks long or 28 days.
In general obstetricians no longer count months of any length and months are not part of the official terminology in dating pregnancy. The average pregnancy lasts approximately days from the first day of the last menstrual period until birth. This works out to about 9 months and approximately 7 days , depending on the particular months being counted. If pregnancy is counted from conception, instead of the previous period, the length is days from conception to estimated due date. This works out at approximately 8 months and 24 days, depending on the particular months being counted.
The common idea of 10 months of pregnancy came about because obstetricians traditionally counted pregnancy in months that were exactly 4 weeks long.
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