SportyCalc is a completely free, no-signup collection of 20+ science-backed fitness calculators that run 100% in your browser – zero data sent to servers, full privacy guaranteed. Unlike bloated apps or ad-heavy sites, it delivers instant results for: BMI, BMR, TDEE & calorie needs Macros, protein/carbs/fat split Body fat % (Navy, YMCA methods), lean body mass 1RM strength estimator, heart rate zones Calories burned, water intake, running pace Ideal/healthy weight formulas (Devine, Hamwi, etc.)