Medical Disclaimer

Not medical advice

Nothing on this website is intended to be, nor should it be taken as, medical advice, diagnosis or treatment. Calculators produce estimates for general information only. They cannot diagnose a condition, and they cannot replace a consultation with a qualified health professional.

When to seek help

If you are worried about a symptom, contact your GP. Outside surgery hours, call NHS 111. In an emergency — for example chest pain, severe bleeding or difficulty breathing — call 999 immediately. Never delay seeking medical help because of something you read on this website.

Limitations of calculators

Risk and screening calculators use population statistics and published methods; results describe averages and may not apply to your individual situation. Some tools are not validated for certain age groups or health conditions — these limitations are described on each calculator page where relevant.

Last updated: September 2026.