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
Frame tendency from bone structure, with optional fat correction.
Body Shape
Shape classification from shoulder, waist, and hip proportions.
Muscle Levels
Lean mass sufficiency for your height and frame (My Fitometer model).
Featured Quizzes
Programs
Premium, research-backed guides in a tidy PDF.
Fat Loss
Sustainable fat loss with habit layering, and adjustments over time.
- Body-fat tracking with weekly recalibration
- Macros guided by training load
- Lifestyle + adherence systems
Full-Body Hypertrophy
Balanced hypertrophy training designed for maximum muscle stimulus and recovery.
- Full-body frequency for optimal growth
- Volume and intensity autoregulated
- Progression rules that actually make sense
Upper-Body Focused Hypertrophy
Upper-body dominant training for visible muscle development and strength carryover.
- Increased upper-body volume allocation
- Shoulder and arm emphasis built in
- Lower body maintained, not neglected
Lower-Body Focused Hypertrophy
Lower-body dominant training focused on strength, size, and long-term joint health.
- High-quality volume for quads, glutes, hamstrings
- Knee- and hip-friendly progression
- Upper body maintained efficiently
30-Day Core Circuit
A progressive core circuit designed to build strength, control, and endurance in 30 days.
- Deep core + trunk stability focus
- Minimal equipment, time-efficient circuits
- Progressions for strength and endurance
View all programs
Browse all plans and filter by your goal