Phenotypic Age Calculator.

Phenotypic Age (PhenoAge), developed by Morgan Levine and colleagues in 2018, converts nine routine blood markers plus your chronological age into a single number: the age at which your measured physiology is "average" in the population. Someone who is 50 by the calendar but has the bloodwork of a typical 42-year-old has a PhenoAge of 42 — and, statistically, the mortality and disease risk that goes with it.

Its appeal is that it is built entirely from cheap, standard labs — albumin, creatinine, glucose, hs-CRP, lymphocyte %, MCV, RDW, alkaline phosphatase, and white blood cell count — yet predicts mortality, healthspan, and disease onset better than chronological age, rivaling far more expensive epigenetic clocks. That makes it the most practical aging clock most people can actually run.

PhenoAge is not a simple average. It feeds the markers into a weighted linear combination, then through a Gompertz mortality function, then back-transforms the result into an age — and every marker must be in the exact units the formula expects (albumin in g/L, creatinine in µmol/L, glucose in mmol/L, the natural log of CRP in mg/dL, and so on). Get a single unit conversion wrong and the answer can be off by a decade, which is exactly why generic calculators and chatbots routinely botch it. This tool does the conversions for you from US or SI inputs.

Treat the result as a trend, not a verdict. Glucose and hs-CRP usually move it the most, and both respond to losing visceral fat, exercise, sleep, and better insulin sensitivity. Re-run the same panel every few months and watch the direction of travel.