Ovulation Calculator To Avoid Pregnancy

Natural Family Planning (NFP) Estimator

Identify high-risk fertile days to help prevent pregnancy naturally. Note: Not 100% effective.

First Day of Last Period

Cycle Length (Days)

Safety Margin (Days)

Cycle Regularity

Avoid Unprotected Sex —

Estimated “Safe” Days —

Expert Tip: Sperm can live inside the female body for up to 5 days. For pregnancy prevention, always assume you are fertile at least 7 days before your expected ovulation.

Disclaimer: This tool is for informational purposes only. The Rhythm Method has a failure rate of ~24% with typical use. Always consult a healthcare provider for family planning.

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