Prediction5 min
How to predict your next period more accurately
Better predictions come from consistent logging, cycle history, and accepting natural variation.
Prediction depends on history
The more past cycles an app can use, the better it can estimate your next one. One cycle is not enough to understand your rhythm.
Logging the first day of your period consistently is one of the most useful things you can do.
Cycles are not clocks
A cycle can be shorter or longer without automatically meaning something is wrong. Predictions should be treated as estimates, not guarantees.
How Luteal helps
Luteal shows days until your next period, your current phase, and cycle trends so predictions become easier to use in real life.
Frequently asked questions
- How do I calculate when my next period is?
- Add your average cycle length to the first day of your last period. For example, if your cycle is 28 days and your last period started May 1, your next period is estimated around May 29. A period tracking app does this automatically based on your logged history.
- How many cycles do I need to track for accurate predictions?
- Generally 3 to 6 cycles are enough to establish a baseline. The more history an app has, the better it can account for natural variation in your cycle.
Luteal
Track your cycle, mood, symptoms, phases and partner sharing in one private iPhone app.
Download on App Store