Browse Categories
Body Composition & Baseline Metrics
Assess shape, mass, and resting needsBMI & Weight Status
WHO ranges, BMI prime, and ponderal index.
Basal Metabolic Rate Suite
Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, and more.
Body Fat Estimator
U.S. Navy tape method, Deurenberg formula, and guidance.
Lean Body Mass
Boer equations with feeds into BMR variants.
Ideal Weight Comparisons
Devine, Hamwi, Miller, and Robinson targets side-by-side.
Body Surface Area
Mosteller, Du Bois, and percent-difference outputs.
Body Frame Size
Classify wrist-based small, medium, or large builds.
Waist Ratios & Risk
Waist-to-hip and waist-to-height health thresholds.
Nutrition & Daily Intake Planning
Dial in calories, macros, hydration, and supplementsTotal Daily Energy Expenditure
Maintenance calories by activity factor plus presets.
Protein Intake Planner
Goal-based ranges for health, fat loss, and muscle gain.
Macronutrient Split
Turn calorie goals into protein, carb, and fat grams.
Fiber Intake Guide
Age, gender, and calorie-based fiber recommendations.
Hydration Calculator
Base needs plus activity and climate adjustments.
Pregnancy Health Toolkit
Trimester weight tracking, due date, and nutrient tips.
Training & Performance Metrics
Plan strength, endurance, and cardio sessionsOne-Rep Max (Epley)
Estimate max strength and see 70/80/90 percent loads.
One-Rep Max (Brzycki)
Alternative estimator tuned for 2-10 rep sets.
One-Rep Max (Lombardi)
Nonlinear approach for higher rep predictions.
One-Rep Max (O'Conner)
Conservative strength estimate for moderate reps.
Max Heart Rate (220 - age)
Quick population estimate with training zones.
Max Heart Rate (Tanaka)
208 - 0.7 x age for updated adult accuracy.
Target Heart Rate (Karvonen)
Heart-rate-reserve zones based on resting pulse.
Calories Burned (METs)
Convert MET values into total and per-minute burn.
Calories per Step
Turn step counts into energy estimates.
Running Pace Conversion
Swap between pace, mph, and km/h instantly.
Race Time Predictor
Use the Riegel formula to project new distances.
VO2 Max (Cooper Run)
Convert 12-minute effort distance to VO2 max.
VO2 Max (Rockport Walk)
Low-impact estimate using a 1-mile brisk walk.