Ovulation Calculator
Find your fertile window — the days you're most likely to conceive.
Your Results
Estimated Ovulation
Fertile Window
Next Period
How Does the Ovulation Calculator Work?
Ovulation typically occurs about 14 days before your next period starts. For a 28-day cycle, that's around day 14. Your fertile window includes the 5 days before ovulation and the day of ovulation itself — giving you about 6 fertile days each cycle.
Sperm can survive for up to 5 days, while an egg is viable for about 12-24 hours after ovulation. Timing intercourse during your fertile window significantly increases your chances of conception.
Signs of Ovulation
- Changes in cervical mucus — becomes clear, slippery, and stretchy (like egg whites)
- Mild pelvic or abdominal pain (mittelschmerz) on one side
- Slight rise in basal body temperature (0.5-1°F after ovulation)
- Increased libido
- Breast tenderness
Tips for Tracking Ovulation
For more accurate tracking, consider ovulation predictor kits (OPKs), tracking basal body temperature daily, or using a fertility monitor. This calculator provides an estimate — individual cycles vary.