Women's health · Period & ovulation calculator
Know your cycle,
ahead of time.
Your next periods, ovulation day and fertile window from the date of your last period.
Your next period
- Likely ovulation
- Fertile window
Stress, illness, travel and changes in weight can all shift a cycle by a few days. A period more than a week late, or cycles that change a lot month to month, are worth checking with a doctor.
Enter the start of your last period (within the past year), a cycle of 21–45 days and a period of 2–10 days.
A general estimate for healthy adults, not a diagnosis. If you are pregnant, under 18 or managing a health condition, check with a doctor first. Nothing you enter is sent to Gewo.
Take it further
Numbers are a start.
A plan is better.
If your cycle is irregular, painful or very heavy, a gynaecologist or women's health expert can help find out why.
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