Ovulation & Fertility Calculator
Estimate your fertile window and ovulation day based on your cycle length. Track your most fertile days for the next 6 cycles.
Average is 28 days
Signs of Ovulation
- Rise in basal body temperature (0.5-1°F after ovulation)
- Change in cervical mucus (clear, stretchy, egg-white consistency)
- Mild cramping or twinge on one side (mittelschmerz)
- Breast tenderness
- Increased sex drive
- Positive ovulation predictor kit (OPK) test
- Light spotting
- Heightened sense of smell
Fertility Tips
- Have intercourse every 1-2 days during the fertile window for best chances
- The most fertile days are the 2-3 days before ovulation and ovulation day itself
- Sperm can survive up to 5 days in the reproductive tract, but the egg only survives 12-24 hours
- Tracking basal body temperature can confirm ovulation but can't predict it in advance
- Ovulation predictor kits (OPKs) detect the LH surge 24-36 hours before ovulation
- Stress, illness, and travel can shift ovulation timing even with regular cycles