Period Predictions
Forecasts from your data, with honest confidence.
7-day free trial · $2.99/mo or $29.99/yr · cancel anytime
Femora predicts your next period and fertile window from your logged cycles, using a weighted average of your recent cycles once you have enough history, and shows a confidence level (high, medium, or low) so you know how much to trust each forecast.
Predictions are only useful if they are honest. Femora forecasts your next period from your own cycle history and tells you how confident it is, rather than projecting false certainty from too little data.
The 30-second version
- Predicts your next period and fertile window from your own cycles
- Gets more accurate the more you log
- Weighted average of your recent cycles once you have 6+
- Every forecast carries a high / medium / low confidence level
More data, sharper forecasts
With fewer than two cycles, Femora uses a sensible default. With a few, it averages them. With six or more, it weights your most recent cycles so the forecast tracks your current pattern rather than old data.
Confidence you can see
Each prediction comes with a confidence level based on how many cycles you have logged and how regular they are - so a forecast from steady cycles reads differently from one based on limited or variable data.
Frequently asked questions
How accurate are Femora's predictions?
Accuracy improves with logging. After six or more cycles Femora uses a weighted average of your recent cycles, and every prediction shows a confidence level so you know how reliable it is.
Why does my prediction say 'low confidence'?
Low confidence usually means you have logged few cycles or your cycles vary a lot. As you log more regular data, confidence rises.
Get Period Predictions in Femora
One subscription unlocks every Femora feature, across cycle, pregnancy, postpartum, menopause, and fertility.
7-day free trial · $2.99/mo or $29.99/yr · cancel anytime