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Know your correct macronutrients before you eat! Macro Calculator is a result followed by many studies related to nutrition and fitness. Macro Calculator is a minimalistic , yet powerful and accurate macro nutrient calculator. All you have to do is enter your information and it will do the work for you! Q: What makes Macro Calculator different than other similar apps?A: Macro Calculator allows you to create your own macros!Basal Metabolic Rate (BMR) is calculated using Mifflin-St Jeor Formula.