Period Calculator
Track your menstrual cycle and predict future periods, ovulation, and fertile windows.
Calendar Legend
Next Period Expected
Thu, Apr 2, 2026
Average cycle length (days)
28 days
Regular
Cycle Regularity
Upcoming Periods
Thu, Apr 2, 2026
Cycle 1
Thu, Apr 30, 2026
Cycle 2
Thu, May 28, 2026
Cycle 3
Thu, Jun 25, 2026
Cycle 4
Thu, Jul 23, 2026
Cycle 5
Thu, Aug 20, 2026
Cycle 6
Fertile Windows & Ovulation
Mar 14 - Mar 20
Ovulation: Mar 19
Cycle 1
Apr 11 - Apr 17
Ovulation: Apr 16
Cycle 2
May 9 - May 15
Ovulation: May 14
Cycle 3
Jun 6 - Jun 12
Ovulation: Jun 11
Cycle 4
Jul 4 - Jul 10
Ovulation: Jul 9
Cycle 5
Aug 1 - Aug 7
Ovulation: Aug 6
Cycle 6
Understanding Your Cycle
A typical menstrual cycle lasts 21-35 days. The cycle has four phases: menstruation (days 1-5), follicular phase (days 1-13), ovulation (day 14), and luteal phase (days 15-28). Tracking helps identify patterns.
Benefits of Tracking
Period tracking helps you prepare for your period, identify irregular cycles, optimize conception timing if trying to conceive, and notice health changes to discuss with your doctor.
When to See a Doctor
Consult a healthcare provider if your cycle is consistently shorter than 21 days or longer than 35 days, you miss periods, have very heavy bleeding, or experience severe pain.