Ovulation calculator
Calculate the estimated ovulation date, fertile window and estimated due date from your last period.
Ovulation
May 15, 2026
Fertile window: May 10, 2026 - May 16, 2026
Fertile windowMay 10, 2026 – May 16, 2026
Next periodMay 29, 2026
Estimated due dateFebruary 5, 2027
Estimate only. Actual ovulation may differ.
Approximate calculation. The exact amount is confirmed by the Social Insurance Board or the Tax and Customs Board - check the official source.
Last updated: 2026-06-03
How to calculate ovulation?
Ovulation occurs about 14 days before the next period. The fertile window is roughly 5 days before to 1 day after ovulation. This is an estimate and does not replace medical advice.