🌼 Period Calculator
Enter the first day of your last period and cycle length to predict the next 6 periods, the ovulation day and fertile window. Personal health reference, local, no upload.
❓ Frequently asked questions
How is ovulation estimated?
As cycle length minus 14 (the luteal phase is usually ~14 days).
What is the fertile window?
About 5 days before to 1 day after ovulation - the higher-conception window.
Is it accurate?
A reference for regular cycles only; real timing varies with stress and health.
📚 How to use
Knowing your cycle helps with planning or trying to conceive.
Steps
- Enter the first day of your last period and cycle length.
- Click "Predict".
- See upcoming periods, ovulation and fertile window.
💡 This is a health reference, not medical advice.