It takes the date of your ultrasound, subtracts the number of weeks at which your ultrasound is done and then adds 280. This method of calculation takes into account the weeks and/or days in which you had an ultrasound.
It’s “often incorrectly estimated due to date of intercourse, which can be several days off from actual date of conception based on the sperm’s ability to survive for five days in the reproductive tract,” she says. Now, Kelly Culwell, M.D., an obstetrician-gynecologist and Forbes Health Advisory Board member, notes that the date of conception isn’t always a reliable method for determining your estimated due date.
This method calculates your due date based on the date of conception by assuming a gestation period of 38 weeks (or 266 days) from the date of conception. Meanwhile, if your cycle is shorter than the average 28 days, your due date is pushed back. If your menstrual cycle is longer than the average cycle of 28 days, your due date is pushed forward and the amount of time you’re pregnant is reduced. To calculate your due date using this method, you also need to input the average length of your menstrual cycle. This method calculates your due date based on the first day of your last period, assuming a typical pregnancy, on average, lasts 40 weeks (or 280 days) from the first day of your last period. Our due date calculator uses the following methods to calculate your due date.
Due Date Calculator For Pregnancy: When Is Your Baby Due? While we work hard to provide accurate and up-to-date information that we think you will find relevant, Forbes Health does not and cannot guarantee that any information provided is complete and makes no representations or warranties in connection thereto, nor to the accuracy or applicability thereof. The compensation we receive from advertisers does not influence the recommendations or advice our editorial team provides in our articles or otherwise impact any of the editorial content on Forbes Health. Second, we also include links to advertisers’ offers in some of our articles these “affiliate links” may generate income for our site when you click on them. This site does not include all companies or products available within the market. The compensation we receive for those placements affects how and where advertisers’ offers appear on the site. First, we provide paid placements to advertisers to present their offers. This compensation comes from two main sources.
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