Conception Date Calculator
Use this conception date calculator to estimate a conception date or related pregnancy date. Enter due date or last menstrual period and cycle details and review an estimated conception date and related dates.
An estimate based on standard obstetric convention (average 28-day cycle) — actual ovulation and conception timing varies between individuals.
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How it works
Conception ≈ LMP + 14 days (typical cycle); or due date − 266 daysHow to use the Conception Date Calculator
Start by entering due date or last menstrual period and cycle details. Keep the units consistent and check that each value belongs to the same question.
The result gives an estimated conception date and related dates. Ovulation timing varies, so dates are approximate. Use it as a guide and check any instructions, rules or professional advice that apply.