How long is a menstrual cycle

Most women believe the average menstrual cycle is 28 days long, but cycles can range from 23 to 35 days. Read on to learn more about periods and fertility.
Do you know how long a menstrual cycle is? You may answer with the textbook 28 days, but a study of more than 30,000 women found that 87% had cycles that fell in the range of 23 to 35 days1.

A Woman's Guide to Her Menstrual Cycle, St. Luke's Health

Period calculator - Flo Health

Periods and fertility in the menstrual cycle - NHS

Menstrual Cycle Management in Adolescents

Periods and fertility in the menstrual cycle - NHS

Menstrual Cycle Length: Why Does It Change?

Menstrual Cycle Myth-Busting

Irregular Menstrual Cycles and When to Take Action

Menstrual Cycle Basics – Your Period

What is a menstrual cycle?

Menstrual Cycle Length: Why Does It Change?

Normal Menstrual Cycle UCSF Center for Reproductive Health

Anovulatory Cycle: What Is It, Causes, Treatment, and More

Cycling on your period: Everything you need to know