Tools
Health calculators, honestly explained.
Every calculator tells you the number andwhat the number can’t tell you — the error bars, the myths, and the questions worth bringing to a real appointment.
También disponible en español →
BMI Calculator
Calculate your body mass index and get an honest explanation of what the number means, where it misleads, and what to ask your doctor.
Calorie (TDEE) Calculator
Estimate your daily calorie burn (TDEE) with the Mifflin-St Jeor equation, plus an honest note on what these estimates get wrong.
Protein Calculator
How much protein per day for health, training, muscle building, age 65+, or while on a GLP-1 — with evidence-based ranges.
Body Fat Calculator
Estimate body fat percentage with a tape measure (US Navy method) and understand the error bars every method carries.
Heart Rate Zone Calculator
Calculate your estimated max heart rate and five training zones (Tanaka + Karvonen methods), with honest notes on their accuracy.
Water Intake Calculator
Estimate daily water needs by weight and exercise — plus the honest truth about the "8 glasses" myth.
GLP-1 Weight Loss Calculator
See what published clinical trials suggest about average weight loss on semaglutide (Wegovy) or tirzepatide (Zepbound) — honestly framed, no hype.
Peptide Reconstitution Calculator
Concentration and syringe-draw math for prescribed compounded peptides — with mcg/mg error checking. Never suggests doses.