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
August 12, 2026
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Fertile window
August 7, 2026 – August 13, 2026
Peak fertility
August 10, 2026 – August 12, 2026
Next period
August 26, 2026
Cycle length
28 days
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.
Wellness Pick
Pair Your Plan With a Daily Wellness Habit
Calculators set the target daily habits make it stick. Add a gentle herbal tea to your morning routine to support digestion, hydration, and a calmer wellness rhythm.
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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.