Fertility Calculator
Calculate your fertile window, ovulation date, and next period based on your cycle length and luteal phase.
Important Health Disclaimer
This calculator provides general health information based on standard medical formulas and WHO guidelines. Results are for informational and educational purposes only and should not be considered as professional medical advice, diagnosis, or treatment recommendations.
For health concerns, medical conditions, fitness plans, or dietary decisions, please consult with qualified healthcare professionals, licensed physicians, registered dietitians, or certified fitness trainers who can evaluate your individual health status and medical history.
Individual health needs vary significantly. These calculations are general estimates and may not be appropriate for everyone, especially those with existing medical conditions, pregnant women, children, or elderly individuals.
Not a substitute for professional medical advice
Cycle Information
How It Works
Ovulation typically occurs at cycle length minus luteal phase days before your next period. The fertile window spans 5 days before ovulation through 1 day after, as sperm can survive up to 5 days.
Ovulation Date
May 4, 2026
14 days ago
Fertile Window
April 29, 2026 – May 5, 2026
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