Women's Health
Ovulation Calculator
Track your fertile window and predict ovulation days for family planning.
📅 Cycle Information
Average Cycle Length
days
Typical range: 21-45 days
Period Duration
days
📆 Date Information
Last Period Start
First day of your last menstrual period
Cycle Regularity
Regular cycles are 21-35 days
⚙️ Advanced Options
Cycle
0
Ovulation Day
—
cycle day
Fertile Window
—
Next Period
—
Cycle Day
—
Fertility Status
—
💡 Health Tip: The fertile window is typically 5 days before ovulation and the day of ovulation. Sperm can survive up to 5 days in the female reproductive tract.
📊 Fertility Calendar
Fertile
Ovulation
Period
Other
📊 Cycle Prediction Schedule
| Date | Cycle Day | Status | Fertility |
|---|
How the formula works
Ovulation Day = Cycle Length − 14 | Fertile Window = Ovulation Day − 5 to Ovulation Day
- Ovulation = Release of egg from ovary (typically 14 days before next period)
- Fertile Window = 5 days before ovulation + day of ovulation (6 days total)
- Luteal Phase = Days after ovulation until next period (typically 14 days)
- Cycle Day 1 = First day of menstrual bleeding
- Most Fertile Days = Day before ovulation and day of ovulation