What is a conception calculator?
A conception calculator estimates ovulation timing, a possible conception date, and a fertile window from cycle dates or a due date.
How is conception date estimated?
The last-period method estimates ovulation from cycle length. The due-date method estimates conception by subtracting 266 days from the due date.
Why conception dates are approximate
Ovulation and fertilisation timing vary, and sperm can survive for several days. Dates alone cannot prove exact conception timing.