Free Calculators
Open, cited formulas. Instant results. No signup.
PhenoAge Calculator
Biological age from a standard blood panel (Levine 2018).
VO2max Calculator
Cooper 12-minute test → VO2max + fitness age + mortality hazard.
TDEE & Macro Calculator
Mifflin-St Jeor maintenance calories + protein/fat targets.
Body Fat % Calculator
U.S. Navy method from tape measurements + fat/lean mass split.
One-Rep Max Calculator
Estimate your 1RM from any set + a full %-of-1RM training table.
Waist-to-Height Ratio
A sharper mortality and metabolic-risk signal than BMI.