Ovulation Calculator

Calculate your fertile window and ovulation date to help with family planning.

The first day of your most recent menstrual period
Count from first day of one period to first day of next
Days from ovulation to next period
Understanding Your Fertile Window
Fertile Days
  • Sperm can survive up to 5 days
  • Egg survives 12-24 hours after ovulation
  • Fertile window is typically 6 days
Signs of Ovulation
  • Changes in cervical mucus
  • Slight increase in body temperature
  • Mild pelvic pain
  • Increased libido
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