Free Online Calculators

Fitness Tools & Calculators

Instant, accurate calculators for strength athletes and gym-goers. Available in metric (kg/cm) and imperial (lb/in) units.

Body Composition

Available

BMI Calculator

Calculate your Body Mass Index instantly. Supports both metric (kg/cm) and imperial (lb/in) units with an interpretation guide.

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Available

FFMI Calculator

Fat-Free Mass Index — the gold standard for evaluating muscle development potential and tracking lean gains over time.

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Strength

Coming Soon

1-Rep Max Calculator

Estimate your one-rep max from any set and rep scheme using multiple validated formulas (Epley, Brzycki, Lombardi).

Coming Soon

Wilks Score Calculator

Normalize your powerlifting total across bodyweight categories with the Wilks coefficient — compare strength fairly.

Nutrition

Coming Soon

TDEE / Calorie Calculator

Estimate your Total Daily Energy Expenditure based on your stats and activity level with macro breakdown.