How the input values are used
First day of last period
The calculation uses this date as a reference point; check whether endpoints are included.
Average cycle length (days)
The numeric value in days is used in the calculation; keep units consistent.
How to interpret the result
- The result uses First day of last period and Average cycle length (days). Change one variable at a time to compare its effect on the outcome.
- Health and fitness values are estimates, not a substitute for measurements or clinical advice.