ZEALO TOOLS
Free fitness calculators
Evidence-based calculators, each paired with the Learn article that explains its formula and its limits. No signup, and nothing you enter leaves your browser.
All tools
TDEE Calculator
Your maintenance calories from the Mifflin-St Jeor equation and an honest activity multiplier.
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Macro Calculator
Protein, carbohydrate and fat targets built from your calories and goal, protein first.
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1RM Calculator
Estimate your one-rep max from any set of 2 to 10 reps, with Epley and Brzycki side by side.
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Protein Calculator
Daily protein in grams from your body weight, goal and training, using the evidence-based per-kilogram ranges.
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Body Fat Calculator
Estimate body fat percentage from tape measurements with the U.S. Navy circumference method.
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