Calorie Calculator — Calculate Your Daily Calorie Needs

How does calorie counting work?

Calorie counting is the foundation of weight management. The body uses energy for three purposes: basal metabolic rate (BMR), the thermic effect of food (TEF), and physical activity. Together, these form total daily energy expenditure, or TDEE. When you know your TDEE, you can adjust calories according to your goal — whether it is weight loss, weight maintenance, or muscle gain.

Calorie deficit — the prerequisite for weight loss

To lose weight, you need to eat fewer calories than you burn — this is called a calorie deficit. A moderate daily deficit of 500 kilocalories leads to about 0.5 kg of weight loss per week. This is a safe and sustainable pace that helps preserve muscle mass and prevents metabolic slowdown. An overly aggressive calorie deficit (over 1,000 kcal) can lead to muscle loss, fatigue, and yo-yo dieting.

Why is the macro split important?

Calorie count alone does not tell the whole story — food quality and macro split significantly impact results. Our calculator divides calories into three macronutrients: protein, carbohydrates, and fats. Each of these serves a different purpose in the body.

Protein is the most important macro for weight loss. It preserves muscle mass during a calorie deficit, increases satiety, and raises the thermic effect of food. During weight loss, we recommend 1.8–2.0 grams of protein per kilogram of body weight per day. If you weigh 70 kg, that means about 140 grams of protein.

Fats are essential for hormone production, brain function, and the absorption of fat-soluble vitamins. We recommend fats to make up about 25–30% of total calories. Too little fat can disrupt hormone function, especially in women.

Carbohydrates fill the remaining calories. They are the body's primary energy source, especially during exercise. Reducing carbohydrates may help some people manage appetite, but they do not need to be eliminated completely — total calorie intake is what matters most.

The Mifflin-St Jeor formula

The calculator uses the Mifflin-St Jeor formula, which has been found to be the most accurate BMR estimation method in studies. The formula takes into account weight, height, age, and sex. BMR tells you how much energy your body burns at complete rest — for breathing, circulation, temperature regulation, and cell renewal.

TDEE is calculated by multiplying BMR by an activity multiplier. Choosing the activity multiplier is the most critical part of the calculation, as even a small difference in the multiplier changes the result by hundreds of calories. Estimate your activity level conservatively — most people overestimate how much they move.

Practical tips

The calorie calculator result is a starting point, not an absolute truth. Individual metabolism, hormones, stress levels, and sleep quality affect actual energy expenditure. We recommend monitoring your weight for 2–3 weeks and adjusting calories based on results. If weight does not decrease, reduce by 100–200 kcal. If weight drops too quickly (over 1 kg/week), increase calories.

Remember that you should not eat below your BMR long-term. It slows metabolism, increases fatigue, and can lead to nutrient deficiencies. Sustainable weight loss is based on a moderate calorie deficit, adequate protein, and regular exercise.