Ovulation Calculator
Find your estimated ovulation date, fertile window, and next expected period based on your cycle details.
Your Estimated Fertile Window
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This is an approximate estimate based on average cycle patterns. Actual ovulation timing can vary.
Understanding Your Fertile Window
Ovulation typically occurs about 14 days before your next period begins, regardless of your total cycle length. This means someone with a 28-day cycle ovulates around day 14, while someone with a 32-day cycle ovulates around day 18.
Your fertile window includes the 5 days leading up to ovulation and the day of ovulation itself, since sperm can survive in the reproductive tract for up to 5 days while the egg is viable for about 12-24 hours after release.
For the most accurate tracking, consider combining this calculator with basal body temperature charting, cervical mucus observation, or ovulation predictor kits (OPKs), especially if you have irregular cycles.
Frequently Asked Questions
When am I most fertile in my cycle? +
You are most fertile during the 5-6 day window ending on your ovulation day, with the 2-3 days before ovulation being the highest-probability days for conception.
How is ovulation date calculated? +
Ovulation typically occurs about 14 days before your next period starts, regardless of cycle length. This calculator estimates it based on your average cycle length and last period start date.
What if my cycle is irregular? +
If your cycles are irregular, this calculator gives only an approximate estimate. Tracking basal body temperature, using ovulation predictor kits, or consulting a fertility specialist can give more accurate results.
How long should I try before seeing a fertility specialist? +
Generally, if you're under 35 and have been trying for 12 months, or over 35 and trying for 6 months, without success, it's a good time to consult a fertility specialist.