What to Look For
Good calculators use established formulas (Mifflin-St Jeor for BMR/TDEE, Navy method for body fat, Epley/Brzycki for 1RM). They support metric and imperial, and don’t require sign-up.
Essential Calculators
BMI — Quick baseline. TDEE — Core for diet planning. Macro — Protein, carbs, fat split. Body fat — Navy method is convenient. 1RM — For strength programming.
Privacy Matters
Client-side calculators (like ours) run in your browser. No data is sent to servers. Your health inputs stay private.