Ovulation & Fertility Calculator
Find your most likely ovulation date and 6-day fertile window based on your cycle length.
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Your results
Estimated Ovulation
June 28, 2026
- Fertile window
- June 23, 2026 - June 29, 2026
- Peak fertility
- June 26, 2026 - June 28, 2026
- Next period (est.)
- July 12, 2026
Understanding the Fertile Window
The fertile window is the 5-6 day stretch ending the day of ovulation. Sperm can survive up to 5 days in the reproductive tract; the egg lives only 12-24 hours after ovulation.
Peak fertility is the 3 days leading up to ovulation.
Signs of Ovulation
- •Egg-white cervical mucus.
- •Slight rise in basal body temperature.
- •Mid-cycle pelvic twinge (mittelschmerz).
- •Positive LH surge on ovulation predictor kits.
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Frequently Asked Questions
How accurate is this?
It's a calendar-based estimate. For most accurate timing, combine with LH strips and basal body temperature tracking.