Health & Fitness Calculators
Track body composition, calorie needs, and the numbers behind your goals. All 6 are free, work in your browser, and explain the formula behind the result.
BMI Calculator
Body mass index with category and healthy weight range.
OpenCalorie & BMR Calculator
Daily calorie needs for losing, holding, or gaining weight.
OpenBody Fat Calculator
Body fat percentage from tape measurements.
OpenIdeal Weight Calculator
Target weight from four clinical formulas plus BMI range.
OpenPregnancy Due Date Calculator
Due date, current week, and trimester milestones.
OpenWater Intake Calculator
Daily hydration target adjusted for exercise and climate.
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