Understand your dietary needs with precision. Calculate calories, macros, protein, and more for your health goals.
Nutrition is the foundation of health, fitness, and performance. Whether you are trying to lose weight, build muscle, manage a health condition, or simply eat more mindfully, understanding the numbers behind your food choices is essential. Our nutrition calculators transform complex dietary science into personalized, actionable recommendations.
All nutrition ultimately comes down to energy balance: the relationship between calories consumed and calories burned. To lose weight, you need a deficit; to gain weight, a surplus; and to maintain, an equilibrium. But not all calories are equal — the macronutrient composition(protein, carbs, fat) affects satiety, muscle retention, hormonal function, and energy levels. Our tools help you calculate both your calorie targets and your ideal macro split.
We use the Mifflin-St Jeor equation for basal metabolic rate (BMR) calculations, which peer-reviewed research has shown to be the most accurate formula for estimating calorie needs within ±10% for 82% of individuals. For protein recommendations, we follow the position of the International Society of Sports Nutrition (ISSN), which recommends 1.4-2.0 g/kg of body weight for active individuals.
Daily calorie needs depend on age, sex, weight, height, and activity level. Most adult women need 1,600-2,400 calories; adult men need 2,000-3,000 calories. Our TDEE calculator uses the Mifflin-St Jeor equation (the most accurate formula) to estimate your specific needs.
Research suggests 0.7-1.0 grams of protein per pound of body weight for muscle building (1.6-2.2 g/kg). For a 170 lb person, that is 119-170 grams of protein per day. Spread your intake across 3-5 meals for optimal absorption. Good sources include chicken breast (31g per 100g), eggs (6g each), and Greek yogurt (17g per cup).
For weight loss, a common split is 40% protein, 30% carbs, 30% fat, which preserves muscle while in a caloric deficit. Some prefer higher protein (up to 40-45%) during cutting phases. The most important factor is maintaining a calorie deficit of 300-500 calories below your TDEE.
The American Heart Association recommends no more than 25g (6 teaspoons) of added sugar per day for women and 36g (9 teaspoons) for men. The average American consumes about 77g per day — more than double the recommended limit. Our sugar calculator helps you visualize hidden sugar in common foods.
Total calories are everything you consume from food and drinks. Net calories subtract the calories burned through exercise: Net Calories = Food Calories - Exercise Calories. For weight loss, your net calories should be below your BMR; for weight gain, above your TDEE.