Luteal Phase Calculator: How Long Is Your Second Cycle Half?
The luteal phase is the second half of your cycle. Its length is usually steadier than the cycle as a whole. Enter your numbers and see which range belongs to it.
What this calculator is not
These calculators are arithmetic on your own numbers. They are not suitable for contraception, they make no diagnosis and they do not predict ovulation. Cycles vary; a calculated day is not a promise.
Follow your phases day by day in the BodySeasons app
In the app you record how you actually feel and recognise your own patterns across weeks and cycles. No points, no streaks, no grading.