Pearl Index (Contraceptive Failure Rate)
Pearl Index (Contraceptive Failure Rate) - a deterministic tool in Sophie Well's Clinical Scoring & Risk group.
Open the Pearl Index (Contraceptive Failure Rate) → Runs in your browser. No signup, no tracking.
What this is
Pearl Index (Contraceptive Failure Rate) is one of 230 deterministic tools in Sophie Well's Clinical Scoring & Risk group. Pearl Index (Contraceptive Failure Rate) - a deterministic tool in Sophie Well's Clinical Scoring & Risk group.
When to use it
Use this tool when you need a quick, citable reference. Every calculation runs entirely in your browser - no inputs leave your device, no account is required, no AI is involved. The site enforces a strict Content Security Policy and ships no analytics or third-party CDN.
References
Pearl R. Factors in human fertility and their statistical evaluation. Lancet. 1933;222(5741):607-611. (Pearl Index.) Read the source ↗
Worked example: Pearl index 2 per 100 woman-years — lower = more effective.
Sophie Well is a reference and educational tool. Not medical, legal, or financial advice. Does not replace clinician judgment, professional billing review, or legal counsel.