2025-07-06 00:00:00 FitApp has very useful fitness calculators for those who want to track their fat loss, muscle mass growth, calorie expenditure and macronutrients, with FitApp you can measure your body statistics such as: body fat percent, fat free mass, fat weight, ffmi, fitness level, daily calories, basal metabolic rate (bmr), macronutrients, and track them over time. FitApp includes the following features: -Body fat percentage calculator: