// multi-utility computation suite · offline · instant · precise
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health.menstrual-cycle-prediction Calculator
Predicts the next period date and ovulation day from the last menstrual period date and average cycle length. Cycle regularity varies — predicting from a single data point is less accurate than from a 3-month rolling average of actual cycle lengths.
Inputs
Cycle Length Days
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Period Duration Days
Length of time the process lasts. Ensure units are consistent with rate inputs.
Last Period Start Day
Time for one complete cycle (s). Period = 1 / frequency. A 50 Hz signal has a 20 ms period.
Results
days until next period
Sample size or count used in the calculation.
ovulation day in cycle
The value at the specified point or condition.
days to ovulation (est.)
The value at the specified point or condition.
fertile window (days from now)
Sample size or count used in the calculation.
variability note
Supplementary information explaining an assumption, caveat, or important context for interpreting the result.