Track your next period, ovulation, and fertile window
Enter the first day of your last period and your average cycle length.
First day of last period
Average cycle length28 days
212835
Assumes a 14-day luteal phase (next period - 14 days). Fertile window spans ovulation -5 to +1 days. Learn more
For reference only. Don't use this as the sole basis for contraception or trying to conceive.