Ovulation Calculator

Worked example

Example: a last period starting on 1 January 2026 with a 28-day cycle.

How the Ovulation Calculator works

Enter your last period date and cycle length. Ovulation usually occurs about 14 days before the next period, and the fertile window is the five days before ovulation plus the day itself.

Formula: Ovulation day = First day of last period + (Cycle length − 14)

What to know before you calculate

Ovulation usually happens about 14 days before the next period, not always on day 14. Cycles that vary in length make calendar estimates less reliable.

Tips for accurate results

Health calculators are educational estimates and not a diagnosis. Consult a doctor or dietitian before making medical or major diet decisions.

Official sources: World Health Organization.

Roman Urdu mein

Aakhri mahwari ki tareekh aur cycle ki lambai daalein to agli mahwari aur fertile dinon ka andaza mil jata hai. Har cycle mukhtalif ho sakti hai, is liye isay yaqeeni na samjhein.