Your science-backed fitness calculators
Accurate models. Clean design. Independent tools with optional cross-fill.
Body Fat %
US Navy or JP-7 skinfolds
BMR & TDEE
Lean-mass BMR + Smart/Athlete TDEE with enhancers.
Macros
Protein, carbs & fats from calories/TDEE.
1RM & 5RM
Learn your rep curve from 2–3 RM points.
Strength Levels
Percentiles vs population (seed model).
BMI
Multi-unit height & weight options.
Body Type
....
Body Shape
....
Muscle Levels
....
Programs
Premium, research-backed guides in a tidy PDF.
Weight Loss
Sustainable fat loss with metrics, meals, and weekly adjustments.
- Body-fat first, not BMI
- Macros by TDEE + activity
- Plate method & shopping lists
$29.99
Buy PDF
Longevity
Movement, sleep, nutrition, and bloodwork habits for a longer healthspan.
- Daily movement ladder
- Sleep + circadian routine
- Quarterly bloodwork guide
$19.99
Buy PDF