See how your recent cycles compare with a clear screening range. Takes about a minute.
Your details
Cycle patterns naturally vary more in the late teens and after the early forties, so age helps us read yours fairly.
The fewest days between two recent periods.
The most days between two recent periods.
Live result
Your cycle pattern will appear here.
This is a screening result based only on the cycle lengths entered. It cannot diagnose a condition or explain why cycles vary.
A typical cycle runs roughly 24 to 38 days, and varying by up to about a week between months is common; in your late teens or after your early forties, a little more variation is normal too. Very few women have the textbook 28-day cycle every single month.
Stress, travel, illness, weight changes, intense exercise, breastfeeding and coming off contraception can all move your cycle around for a while. One unusual month is information, not an alarm.
Doctors read cycles the way you would read weather, looking at the pattern across months rather than a single data point. Noting your start dates for three to six months gives any doctor much more to work with.
Gaps of three months or more, cycles that are usually shorter than 21 days or longer than about 42 days, very heavy bleeding, or pain that disrupts your day are all worth a proper conversation, whatever a calculator says.
Share what is going on, and a gynecologist will look at your whole picture. Clear answers, a calm plan, no judgment.
Dr. Geeta S K · Gynecologist, 11 years in practice
Not ready yet? Start with the free 2-minute check