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A July due date means conception in October to early November of the previous year. Find your exact date below.
When Did I Conceive If Due in July: If your due date is in July, you most likely conceived between October 8 and November 7 of the previous year — your due date minus 266 days. Due July 1 → conceived around October 8; due July 15 → around October 22; due July 31 → around November 7. The fertile window adds ±5 days.
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When Did I Conceive If Due in July — If your due date is in July, your likely conception date is your due date minus 266 days (38 weeks) — October 8 – November 7 of the previous year — with a ±5-day fertile window on either side.
Find your exact due date row in the table below for the likely conception date.
Or enter your due date in the calculator above for the exact, leap-year-aware answer.
Treat the result as a window: conception happens at ovulation, up to 5 days after intercourse.
If an ultrasound has revised your due date, use the revised date — it's the more accurate anchor.
Computed as due date − 266 days. The window column adds the ±5-day fertile window around the likely ovulation/conception day:
| Due date | Likely conception | Fertile window | Year |
|---|---|---|---|
| July 1 | Oct 8 | Oct 3 – Oct 13 | previous year |
| July 5 | Oct 12 | Oct 7 – Oct 17 | previous year |
| July 10 | Oct 17 | Oct 12 – Oct 22 | previous year |
| July 15 | Oct 22 | Oct 17 – Oct 27 | previous year |
| July 20 | Oct 27 | Oct 22 – Nov 1 | previous year |
| July 25 | Nov 1 | Oct 27 – Nov 6 | previous year |
| July 31 | Nov 7 | Nov 2 – Nov 12 | previous year |
Dates use a non-leap reference year and can shift by one day when the 266-day span crosses February 29 — the calculator above computes your exact dates.
July-due pregnancies began in the October–early-November window of the previous year. For school-age planning, July birthdays sit near many countries' school-entry cutoffs (September 1 in much of the US, so July children are among the youngest in their class; August 31 in England makes them nearly the youngest). If a summer-vs-autumn school start matters to your family planning, the conception window here — Halloween season, roughly — is the one that produces those cusp birthdays.
Medical Disclaimer
This calculator provides estimates only. Always consult with your healthcare provider for accurate pregnancy dating and medical advice.
Conception Date: The estimated date when fertilization occurred, typically 11-21 days after the first day of your last menstrual period.
Conception Range: A four-day timeframe during which fertilization most probably occurred, taking into consideration that sperm can remain viable in the reproductive tract for 3-5 days.
Gestational Age: The age of the pregnancy calculated from the first day of the last menstrual period, not the actual conception date.