Enter your cycle details to find your most fertile days this month. Know exactly when to try for the best chance of conception.
We'll show you the 6 days each cycle when pregnancy is possible.1
Generated by FertileStart.com on
The highest pregnancy rates occur when you have sex in the 2 days leading up to ovulation—not on ovulation day itself.1
ASRM recommends intercourse every 1-2 days during your fertile window for optimal conception chances.1
This calculator estimates based on averages. For precise timing, use ovulation predictor kits (OPKs) to detect your LH surge.
Calculators estimate based on averages. These tools confirm your actual fertile days.
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Our ovulation calculator estimates your fertile window based on the calendar method. Here's the science behind it:
Calendar-based predictions work best for women with regular cycles. However, even regular cycles can vary by a few days month to month.
For more precise tracking, consider combining this calculator with:
If your cycles are irregular (varying by more than 7 days), consult a healthcare provider for personalized guidance.