Oatsy provides recommendations to your daily nutrition, weight, and exercise needs. It is not a medical device or app, and is not intended to diagnose, prevent, advice, or treat patients on medical conditions. You should always check with a doctor in addition to using the app and before making medical decisions.

Sources of recommendations

Calorie calculations

Calculation is based on basal metabolic rate (BMR). BMR is the amount of energy needed while resting in a temperate environment when the digestive system is inactive. Oatsy uses the Mifflin-St Jeor Equation:

[Men] BMR = 10W + 6.25H - 5A + 5

[Women] BMR = 10W + 6.25H - 5A - 161


  • W is body weight in kg

  • H is body height in cm

  • A is age

  • F is body fat in percentage


  • https://www.calculator.net/bmr-calculator.html

  • Johnstone AM, Murison SD, Duncan JS, Rance KA, Speakman JR, Factors influencing variation in basal metabolic rate include fat-free mass, fat mass, age, and circulating thyroxine but not sex, circulating leptin, or triiodothyronine1. Am J Clin Nutr 2005; 82: 941-948.

Weight loss & gain calculations

Based on the NIH Body Weight Planner and adapted from research collected at the National Institute of Diabetes and Digestive and Kidney Diseases—takes into account the adaptive nature of metabolism and gives more accurate information on how hard you’ll have to work (and how long it may take) to reach your goals.

Fit score

FitScore is based on your Body mass index (BMI), food consumption, physical activity as recommended by the FDA and U.S department of health.

Food ratings

Food rating is based on food traffic light rating system. Based on how much fat, saturated fat, sugar and salt are in that food.

Activity level

Determining your activity level for calorie intake.

Drinking water

Determining how much water you should drink, and the benefits of drinking water.