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

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

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

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

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

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