Track your menstrual cycle in a few simple steps.
Input the first day of your last menstrual period.
Provide your average cycle length in days (typically 28 days).
Input how many days your period typically lasts.
Review your next period date, fertile window, and ovulation day.
Period calculators are estimates based on average cycle patterns. Actual dates may vary due to stress, health changes, or natural cycle variations.
A normal cycle ranges from 21 to 35 days, with 28 days being average. Cycles may vary by a few days each month.
The fertile window is typically the 5-6 days leading up to and including ovulation. This is when conception is most likely to occur.