Health Calculator

Ovulation Calculator

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Predict your most fertile days based on your last menstrual period and average cycle length. Ovulation typically occurs ~14 days before the next period.

Fertile Window

Your fertile window is roughly the 5 days before ovulation plus the day of ovulation itself. Sperm can survive up to 5 days inside the reproductive tract; an egg lives ~24 hours after release.

Improving Accuracy

  • Track basal body temperature (rises ~0.3°C after ovulation).
  • Watch for cervical mucus changes (clear, stretchy near ovulation).
  • Use ovulation-predictor kits to confirm the LH surge.
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