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Ovulation & Period Calculator

Predict your next periods, likely ovulation day and fertile window for the next three cycles.

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These are estimates based on the calendar method and do not guarantee or prevent pregnancy. They are less reliable for irregular cycles. Consult a gynaecologist for fertility, cycle or contraception concerns. Medical disclaimer

When is my fertile window?

Ovulation usually happens about 14 days before your next period starts. Your fertile window is roughly the five days before ovulation, the day of ovulation and the day after, because sperm can survive for a few days. In a regular 28-day cycle, that is usually around days 10 to 16. Irregular cycles make predictions less reliable.

How this calculator works

  1. 1

    Your next periods are predicted by adding your average cycle length to the first day of your last period.

  2. 2

    Ovulation is estimated at 14 days before each next period.

  3. 3

    Your fertile window is the 5 days before ovulation, ovulation day and the day after.

Frequently asked questions

No. Calendar-based predictions are estimates and are not a reliable method of contraception. Speak with a gynaecologist about contraception options.

Predictions are less reliable when cycles are irregular, as is common with PCOS. Tracking symptoms and speaking with a gynaecologist can help. Our PCOS and fertility nutrition programs can support your overall wellness.

See a doctor if your periods are very irregular, very heavy or painful, stop for several months, or if you have been trying to conceive for 12 months (or 6 months if you are over 35) without success.

Structured support

Programs that can help

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    Balanced meals, better sleep, calmer days and cycle awareness — practical habits designed around your life.

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