Period Calculator

Name: Period Calculator
Rating: 4.9 (2876 reviews)

Predict your next period dates for the coming months.

Calculator

First Day of Last Period

Cycle Length (days)

Period Duration (days)

Result

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Average cycle is 28 days (range: 21–35). Period lasts 3–7 days. Irregular cycles may be caused by stress, PCOS, thyroid issues, or hormonal changes. Consult a gynaecologist if cycles are consistently irregular.