Pregnancy Conception Calculator
Estimate conception timing from an estimated due date and average cycle length.
Estimated conception date
January 19, 2026
calendar estimate, not a confirmed date
Estimated last periodJanuary 5, 2026
Due date enteredOctober 12, 2026
Fertile window estimateJan 14, 26 – Jan 20, 26
Conception timing varies and estimates can be off by days. Estimates for general guidance only — not medical advice. Check with a qualified healthcare professional for personal decisions.
About the Pregnancy Conception Calculator
Estimate conception timing from an estimated due date and average cycle length.
It runs entirely in your browser — nothing you type is sent to a server — and the result updates as you edit the inputs. Estimates are for educational and informational purposes only; see ourdisclaimer.
Common searches
- conception date
- pregnancy
- fertile window
Related calculators
Pregnancy CalculatorEstimate due date, current gestational age, and ovulation from the last period date.Due Date CalculatorEstimate a due date from a last period, conception date, or current pregnancy week.Ovulation CalculatorEstimate ovulation and the fertile window from the first day of the last period.
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