{"id":23018,"date":"2026-06-27T04:52:32","date_gmt":"2026-06-27T04:52:32","guid":{"rendered":"https:\/\/www.youragecalculator.com\/blog\/?p=23018"},"modified":"2026-06-27T04:52:32","modified_gmt":"2026-06-27T04:52:32","slug":"pregnancy-due-date-calculator-how-to-calculate-your-due-date","status":"publish","type":"post","link":"https:\/\/www.youragecalculator.com\/blog\/pregnancy-due-date-calculator-how-to-calculate-your-due-date\/","title":{"rendered":"Pregnancy Due Date Calculator: How to Calculate Your Due Date and Track Pregnancy Week by Week"},"content":{"rendered":"\n

One of the first questions after finding out you are pregnant is: “When is my due date?” While no due date is exact \u2014 only about 5% of babies arrive on their exact due date \u2014 having an estimated date helps you plan prenatal appointments, track fetal development, and prepare for the big day.<\/p>\n\n\n\n

Use our pregnancy due date calculator<\/a> to get your estimated due date instantly. Just enter the first day of your last menstrual period, and the tool calculates the rest.<\/p>\n\n\n\n

How Due Dates Are Calculated<\/h2>\n\n\n\n

The standard method for calculating a due date is called Naegele\u2019s Rule. It works like this: take the first day of your last menstrual period (LMP), add 280 days (40 weeks), and you have your estimated due date. This 40-week count assumes a 28-day menstrual cycle with ovulation on day 14.<\/p>\n\n\n\n

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Step<\/th>Calculation<\/th>Example<\/th><\/tr><\/thead>
1. Start with LMP<\/td>First day of last period<\/td>January 1, 2026<\/td><\/tr>\n
2. Add 280 days<\/td>Add 9 months + 7 days<\/td>October 8, 2026<\/td><\/tr>\n
3. Adjust for cycle<\/td>If cycle > 28 days, add the difference<\/td>+3 days for 31-day cycle<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n

Alternative Calculation Methods<\/h2>\n\n\n\n

Not all pregnancies follow the standard LMP method. Here are other ways healthcare providers estimate due dates:<\/p>\n\n\n\n