Free tools
Fitness calculators
Five free calculators, no signup, nothing sent anywhere — the numbers, and what they actually mean.
FFMI Calculator
Fat-Free Mass Index — how much muscle you carry relative to height.
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BMI Calculator
The standard number, plus an honest take on where it breaks down.
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One Rep Max Calculator
Estimate your 1RM from any weight and rep count, plus a % table.
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Lean Body Mass Calculator
With a body fat % you know, or estimated without one.
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Macro Calculator
Daily calorie, protein, carb and fat targets for your goal.
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Numbers are half the picture
Every calculator here gives you a number based on a formula — useful, but formulas don't know what you actually look like. If you want the other half, Callout-AI grades your physique S to E from one photo: per-muscle scores, an honest weakest-point callout, no flattery.
Get your grade — free
One photo, graded S to E. No card.