Medical Calculators & Decision Tools

MDCalc (medical calculators) 
Over 300 interactive prediction tools. Links for downloading app to iphone or Android.

Mayo Clinic Calculators 
Includes MELD.

Lab Tests Online 
AACC (American Association for Clinical Chemistry) & other clinical partners.

Likelihood Ratios from NNT 
NNT is the Number Needed to Treat. This site offers an extensive framework and rating system of therapies based on patient benefits and harms as well as diagnostic evaluations.

Breast Cancer Risk Assessment
Allows health professionals to estimate a woman’s risk of developing invasive breast cancer over the next 5 years and up to age 90 (lifetime risk).Uses a woman’s personal medical and reproductive history and the history of breast cancer among her first-degree relatives (mother, sisters, daughters) to estimate absolute breast cancer risk—her chance or probability of developing invasive breast cancer in a defined age interval.