Published methods, implemented from source
Calculators
Each calculator implements a published formula, cites its source, and states plainly what the result can and cannot tell you. Values are processed in your browser — nothing is sent to us or stored.
In preparation
These require a published formula and reference dataset we can cite. They are listed rather than shipped as non-functional placeholders.
VO₂ max estimator and age comparison
Estimates cardiorespiratory fitness from a submaximal or field test and places it against age and sex norms.
Grip strength percentile explorer
Places a measured grip strength against published reference values by age and sex.