Period Cycle Tracker
Track your cycle, predict periods, and find your fertile window.
Average is 28 days
Usually 3-7 days
Current Phase
Ovulation Phase
Cycle Day 15 of 28
Next Period In
14
days
Peak fertility window. You may feel more energetic and social. Best time for conception.
Next Period
Tue, 17 Feb
14 days away
Ovulation Day
Tue, 3 Feb
Passed this cycle
Fertile Window
Thu, 29 Jan
to Wed, 4 Feb
Upcoming Periods
Period 1
Tue, 17 Feb
Period 2
Tue, 17 Mar
Period 3
Tue, 14 Apr
Understanding Your Cycle
Menstrual
(Days 1-5)Uterine lining sheds
Follicular
(Days 6-13)Estrogen rises, energy increases
Ovulation
(Days 14-16)Egg released, peak fertility
Luteal
(Days 17-28)Progesterone rises, PMS possible
Note: This calculator provides estimates based on average cycle patterns. Every body is different. For medical concerns or very irregular cycles, please consult a gynecologist.
How accurate is this calculator?
This provides estimates based on average cycle patterns. Actual cycles can vary due to stress, health, travel, and other factors. Track multiple cycles for better predictions.
What is a normal cycle length?
Normal cycles range from 21-35 days, with 28 days being average. Cycles shorter than 21 or longer than 35 days may need medical attention.
When is the fertile window?
The fertile window is typically 5 days before ovulation and 1 day after. Ovulation usually occurs 14 days before your next period, not 14 days after your last period.
Can irregular periods affect predictions?
Yes. If your cycle length varies significantly, predictions will be less accurate. Consider tracking your actual periods for several months to find your average cycle length.