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Conceived in December: When Is Your Due Date?

If you conceived in December, your baby is most likely due in August or September. Find the date for each day below.

Or your ovulation / insemination date.

Your estimated due date, week of pregnancy and trimester will appear here.

Due dates for a December 2026 conception

A due date is about 266 days (38 weeks) after conception. The table shows the estimated due date for each day of December 2026. For other years the dates are the same or within a day.

Conception dateEstimated due date
Dec 1, 2026Tuesday, August 24, 2027
Dec 2, 2026Wednesday, August 25, 2027
Dec 3, 2026Thursday, August 26, 2027
Dec 4, 2026Friday, August 27, 2027
Dec 5, 2026Saturday, August 28, 2027
Dec 6, 2026Sunday, August 29, 2027
Dec 7, 2026Monday, August 30, 2027
Dec 8, 2026Tuesday, August 31, 2027
Dec 9, 2026Wednesday, September 1, 2027
Dec 10, 2026Thursday, September 2, 2027
Dec 11, 2026Friday, September 3, 2027
Dec 12, 2026Saturday, September 4, 2027
Dec 13, 2026Sunday, September 5, 2027
Dec 14, 2026Monday, September 6, 2027
Dec 15, 2026Tuesday, September 7, 2027
Dec 16, 2026Wednesday, September 8, 2027
Dec 17, 2026Thursday, September 9, 2027
Dec 18, 2026Friday, September 10, 2027
Dec 19, 2026Saturday, September 11, 2027
Dec 20, 2026Sunday, September 12, 2027
Dec 21, 2026Monday, September 13, 2027
Dec 22, 2026Tuesday, September 14, 2027
Dec 23, 2026Wednesday, September 15, 2027
Dec 24, 2026Thursday, September 16, 2027
Dec 25, 2026Friday, September 17, 2027
Dec 26, 2026Saturday, September 18, 2027
Dec 27, 2026Sunday, September 19, 2027
Dec 28, 2026Monday, September 20, 2027
Dec 29, 2026Tuesday, September 21, 2027
Dec 30, 2026Wednesday, September 22, 2027
Dec 31, 2026Thursday, September 23, 2027

What this means for your baby’s birthday

A December conception gives due dates from August 24, 2027 to September 23, 2027. Because most babies are born within about two weeks of the due date, the actual birthday could fall in the month before or after. Conception dates are rarely known exactly: if you are working from intercourse dates, conception may have happened a few days later.

Other conception months

January · February · March · April · May · June · July · August · September · October · November

Know the exact day? Enter it in the calculator above or the Conception Due Date Calculator.

Frequently asked questions

If I conceived in December, when is my due date?

In August or early September — 266 days after the conception date. The table on this page lists each day.

How is a due date calculated from conception?

Add 266 days (38 weeks) to the conception date.

Conception Due Date CalculatorDue date from your conception or ovulation date.Conception Date CalculatorWork out when you conceived from your last period or due date.Due Date CalculatorEstimate your due date from your last period, conception date or IVF transfer.Baby Due Date CalculatorWhen will my baby be born? Birth month, sign and birthstone.Date CalculatorDays between dates, or add and subtract days, weeks, months and years.Pregnancy CalculatorYour week of pregnancy, due date, trimester and what is happening this week.

Formulas reviewed and page updated October 6, 2026.