Health calculators and lab interpretation tools

Numbers on their own are not much use. Each of these tools does the arithmetic, then explains what the result means, where the reference range came from, and what would have to be true for it to be misleading. None of them is a diagnosis, and none of them replaces the clinician who has your history.

• Phenotypic age calculator The one biological age estimate built from a standard blood panel and validated against mortality, implemented exactly as published rather than approximated.
• VO2 max calculator Two validated field estimates of the fitness measure most strongly tied to long term mortality risk, with plain interpretation and the limits of each method.
• Lean body mass calculator Weight tells you almost nothing on its own. This splits it into the part that is metabolically active tissue and the part that is not.
• HOMA-IR calculator The index that puts a number on fasting insulin resistance, using two results that are already on most blood panels.
• Cholesterol ratio calculator Three numbers your lipid panel already contains but usually does not print, and what each one adds beyond LDL alone.
• Triglyceride to HDL ratio calculator The cheapest signal of insulin resistance hiding in a standard lipid panel, and the one most annual physicals never mention.
• Waist to height ratio calculator One measurement, one division, and a better signal about where your fat sits than BMI can give you.
• Waist to hip ratio calculator The measurement that describes fat distribution rather than fat quantity, and the WHO thresholds that go with it.
• eGFR calculator The number on your metabolic panel that gets glanced at and ignored, calculated with the current equation and explained properly.
• DEXA body composition calculator A DEXA report gives you kilograms and percentages. What you actually want is those numbers adjusted for your height, and to know which ones have published reference cutoffs.