Conception Calculator
Calculate your conception date from your due date, last period or birth date with this free online conception calculator. See the likely date range.
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How to use Conception Calculator
- 1Choose whether to calculate from your due date, last period or baby's birth date
- 2Enter the date and your usual cycle length
- 3Read the estimated conception date, the likely range and the matching due date
Frequently asked questions
How is the conception date calculated?▾
Pregnancy is dated from the first day of the last period. Ovulation, and so conception, usually happens about 14 days before the next period — day 14 in a 28-day cycle, which is 266 days before the due date.
How accurate is a conception calculator?▾
It gives an estimate, usually within a few days. Sperm can live up to 5 days and cycles vary, so the exact day of intercourse can differ from the conception date. An early ultrasound is the most accurate way to date a pregnancy.
Can I find my conception date from my baby's birthday?▾
Yes, assuming a full-term birth around 40 weeks. Conception is about 38 weeks (266 days) before birth. If the baby came early or late, the real date shifts accordingly.
Embed Conception Calculator on your website▾
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