Fertility Window Calculator
Your most fertile days for trying to conceive, based on your cycle.
✓ Reviewed by Dr. Poonam Sekhon Chahal · 24 May 2026
How this is calculated
The fertile window is the 5 days before ovulation plus the day after. Ovulation ≈ last period + (cycle length − 14).
Sources
This calculator is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. The result is based on standard clinical formulas applied to the values you entered — your individual situation may need adjustments your doctor can make. Never disregard professional medical advice or delay seeking it because of something you read or calculated on healthcalculus.