Cycle length calculator
A simple cycle length calculator to track and predict menstrual cycle duration. Enter the start dates of your periods to calculate average cycle length, identify patterns, and estimate future cycle dates for better planning.
What is the menstrual cycle?
The menstrual cycle is a monthly process in which the female body prepares for potential pregnancy. It involves hormonal changes that regulate the growth and shedding of the uterine lining, ovulation (release of an egg), and menstruation (bleeding).
How long does a period last?
A period typically lasts 3–7 days, but this varies. Flow may be light, moderate, or heavy, depending on the individual
What is considered a normal menstrual cycle length?
A normal cycle ranges from 21 to 35 days. Variations are common, especially during puberty, perimenopause, or due to stress, diet, or medical conditions.