Body composition
Understand common body metrics and their limitations.
Loading page
Health estimates
Health & Fitness decisions, connected.
Turn general formulas into understandable planning ranges.
12 focused tools3 guided pathsVisible formulas & assumptions
These tools support education and planning. They do not diagnose conditions or replace advice from a qualified professional.
Nutrition planning
Estimate energy, protein, macros, and hydration from your assumptions.
Training
Plan pace and exercise intensity with transparent formulas.
All health & fitness calculators
12 tools with visible formulas, scope, and maintenance status.
BMI Calculator
Calculate bmi from clearly explained inputs.
Calorie Needs Calculator
Calculate calorie needs from clearly explained inputs.
Weight Change Timeline Calculator
Calculate weight change timeline from clearly explained inputs.
Protein Intake Calculator
Calculate protein intake from clearly explained inputs.
Heart Rate Zone Calculator
Calculate heart rate zone from clearly explained inputs.
Running Pace Calculator
Calculate running pace from clearly explained inputs.
Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy circumference method.
Lean Body Mass Calculator
Estimate lean mass and fat mass from body weight and body-fat percentage.
Macro Calculator
Estimate daily calories and protein, carbohydrate, and fat targets from an explicit planning profile.
Water Intake Calculator
Build a daily hydration planning target from body weight, activity, heat, and other fluids.
Pregnancy Due Date Calculator
Estimate a due date and pregnancy timing from the first day of the last menstrual period.
Sleep Calculator
Plan bedtimes and wake times around full sleep cycles and a wind-down period.