Question 1

How is ovulation estimated?

Accepted Answer

For a regular cycle, ovulation is estimated as cycle length minus 14 days from the first day of your last period. Your fertile window includes the five days before and the day of ovulation.

Question 2

Is this a form of contraception?

Accepted Answer

No. This calculator estimates when you may be most fertile — it is not reliable for preventing pregnancy. If you're trying to avoid pregnancy, use a proven method and speak with a clinician.

Question 3

What if my cycle is irregular?

Accepted Answer

Irregular cycles make ovulation harder to predict. Ovulation predictor kits, basal body temperature tracking or a fertility specialist can give a more personal picture.

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Ovulation Calculator

Frequently asked questions