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Last period started in October: when is the next one?

Find the day your last period started in the left column and your usual cycle length along the top. The date where they meet is the estimated start of your next period. October has 31 days.

With a 21-day cycle, a period that starts on October 1 to 10 is followed by the next one before October ends. With a 28-day cycle, a period that starts on October 1 to 3 is followed by the next one before October ends.

Last start21-day cycle25-day cycle28-day cycle30-day cycle32-day cycle35-day cycle
Oct 1Oct 22Oct 26Oct 29Oct 31Nov 2Nov 5
Oct 2Oct 23Oct 27Oct 30Nov 1Nov 3Nov 6
Oct 3Oct 24Oct 28Oct 31Nov 2Nov 4Nov 7
Oct 4Oct 25Oct 29Nov 1Nov 3Nov 5Nov 8
Oct 5Oct 26Oct 30Nov 2Nov 4Nov 6Nov 9
Oct 6Oct 27Oct 31Nov 3Nov 5Nov 7Nov 10
Oct 7Oct 28Nov 1Nov 4Nov 6Nov 8Nov 11
Oct 8Oct 29Nov 2Nov 5Nov 7Nov 9Nov 12
Oct 9Oct 30Nov 3Nov 6Nov 8Nov 10Nov 13
Oct 10Oct 31Nov 4Nov 7Nov 9Nov 11Nov 14
Oct 11Nov 1Nov 5Nov 8Nov 10Nov 12Nov 15
Oct 12Nov 2Nov 6Nov 9Nov 11Nov 13Nov 16
Oct 13Nov 3Nov 7Nov 10Nov 12Nov 14Nov 17
Oct 14Nov 4Nov 8Nov 11Nov 13Nov 15Nov 18
Oct 15Nov 5Nov 9Nov 12Nov 14Nov 16Nov 19
Oct 16Nov 6Nov 10Nov 13Nov 15Nov 17Nov 20
Oct 17Nov 7Nov 11Nov 14Nov 16Nov 18Nov 21
Oct 18Nov 8Nov 12Nov 15Nov 17Nov 19Nov 22
Oct 19Nov 9Nov 13Nov 16Nov 18Nov 20Nov 23
Oct 20Nov 10Nov 14Nov 17Nov 19Nov 21Nov 24
Oct 21Nov 11Nov 15Nov 18Nov 20Nov 22Nov 25
Oct 22Nov 12Nov 16Nov 19Nov 21Nov 23Nov 26
Oct 23Nov 13Nov 17Nov 20Nov 22Nov 24Nov 27
Oct 24Nov 14Nov 18Nov 21Nov 23Nov 25Nov 28
Oct 25Nov 15Nov 19Nov 22Nov 24Nov 26Nov 29
Oct 26Nov 16Nov 20Nov 23Nov 25Nov 27Nov 30
Oct 27Nov 17Nov 21Nov 24Nov 26Nov 28Dec 1
Oct 28Nov 18Nov 22Nov 25Nov 27Nov 29Dec 2
Oct 29Nov 19Nov 23Nov 26Nov 28Nov 30Dec 3
Oct 30Nov 20Nov 24Nov 27Nov 29Dec 1Dec 4
Oct 31Nov 21Nov 25Nov 28Nov 30Dec 2Dec 5

Periods often start a few days either side of an estimate. Every date here is an estimate from a typical cycle length. It is not birth control and it is not medical advice.

Estimate the next six periods with your own cycle length

Log the first day of each period in Isla and it keeps the next estimate, a range and the calendar up to date on your iPhone. No account and no ads.

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