Work out ovulation prediction instantly with clear inputs, formula shown and shareable results.
Predicts ovulation as 14 days before the next expected period and widens the estimate by your recorded cycle variability.
Ovulation timing
Ovulation day = cycle length - 14; prediction window = ovulation day plus or minus recorded cycle variability
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
The luteal phase is the most consistent part of the cycle, averaging about 14 days regardless of total cycle length.
A sustained basal temperature rise, a mid-luteal progesterone level or a positive LH surge test.