Period Calculator
days
days
days
Your Cycle Overview
Next Period
-
Estimated start date
Ovulation
-
Most fertile day
Fertile Window
-
Best days to conceive
Luteal Phase
-
Post-ovulation phase
Cycle Calendar
Cycle Phases
Menstrual Phase
Days 1-5: Shedding of uterine lining
Follicular Phase
Days 6-13: Follicles develop in ovaries
Ovulation
Day 14: Egg is released from ovary
Luteal Phase
Days 15-28: Uterine lining prepares for pregnancy
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About This Period Calculator
Our Period Calculator helps you track your menstrual cycle using the original color scheme, with improved mobile responsiveness.
How it works: The calculator uses the first day of your last period and your average cycle length to estimate:
- Your next period start date
- Ovulation day (typically 14 days before next period)
- Fertile window (5 days before ovulation)
- Different phases of your menstrual cycle
Note: These are estimates only. Track your actual cycles for more accurate predictions.