Calorie Calculator

Estimate your Total Daily Energy Expenditure (TDEE) and recommended calorie intake based on your age, sex, weight, height, and activity level.

How Daily Calorie Needs Are Calculated

Your daily calorie requirement depends on your Basal Metabolic Rate multiplied by an activity factor. BMR represents the calories your body burns at complete rest to maintain basic functions like breathing, circulation, and cell production. Activity multipliers range from 1.2 for sedentary individuals to 1.9 for extremely active people. Our calculator uses the Mifflin-St Jeor equation, which research shows is the most accurate BMR estimation method for most adults.

Calories for Weight Management

Weight loss requires a caloric deficit where you consume fewer calories than you burn. A deficit of 500 calories per day produces approximately 0.5 kg of fat loss per week. Weight gain for muscle building requires a surplus of 200 to 500 calories above maintenance. Extreme deficits below 1200 calories for women or 1500 for men are generally unsustainable and may cause muscle loss, metabolic adaptation, and nutritional deficiencies. Moderate deficits of 15 to 25 percent below maintenance are more sustainable and preserve muscle mass.

Beyond Calories: Quality Matters

While calorie balance determines weight change, food quality affects health, satiety, and body composition. Protein-rich foods support muscle preservation and increase satiety. Fiber from vegetables, fruits, and whole grains promotes digestive health and fullness. Processed foods with added sugars provide calories without nutritional benefit. Our BMR Calculator provides your baseline metabolic rate, and our Fitness Guide offers comprehensive nutrition strategies.

Activity Level Definitions

Accurately selecting your activity level is crucial for reliable calorie estimates. Sedentary means desk work with little to no exercise. Lightly active includes 1 to 3 days of light exercise per week or a job with some walking. Moderately active means 3 to 5 days of moderate exercise or an active job like construction. Very active includes 6 to 7 days of hard exercise or a physically demanding job plus exercise. Extremely active applies to professional athletes or those with very physically demanding jobs combined with additional training. Most people overestimate their activity level, so when in doubt, choose one level lower.

Frequently Asked Questions

What is TDEE and how is it estimated?

TDEE stands for Total Daily Energy Expenditure — the total number of calories your body uses in a day. It is estimated by first calculating your Basal Metabolic Rate (the calories burned at rest) using an equation such as Mifflin-St Jeor, then multiplying by an activity factor that reflects how active you are. The calculator combines your age, sex, height, weight, and activity level to produce this figure, which is the foundation for any plan to lose, maintain, or gain weight.

How many calories should I eat to lose weight?

To lose weight you need a calorie deficit — eating fewer calories than your TDEE. A common, sustainable target is a deficit of about 500 calories per day, which tends to produce roughly half a kilogram (about one pound) of fat loss per week. Larger deficits speed up loss but are harder to maintain and can cost muscle and energy. The calculator gives your maintenance TDEE so you can subtract a sensible deficit to find a realistic daily target.

How do I gain weight or build muscle?

To gain weight you need a calorie surplus — eating more than your TDEE — combined with resistance training if your goal is muscle rather than fat. A moderate surplus of a few hundred calories a day supports lean gains while limiting excess fat. Adequate protein and progressive strength training are essential for turning extra calories into muscle. Use your TDEE as the baseline and add a controlled surplus on top.

Why do calorie needs differ between people?

Calorie needs depend on body size, sex, age, muscle mass, and activity level. Larger and more muscular bodies burn more at rest, men generally have higher needs than women of the same weight due to body composition, and needs tend to fall with age. Activity is often the biggest variable — a very active person can need hundreds or thousands more calories than a sedentary one of identical size. That is why the calculator asks for several inputs rather than giving a single universal number.

Are calorie estimates exact?

No. The equations used are well-validated averages, but individual metabolism varies, and self-reported activity levels are easy to over- or under-estimate. Treat the result as a well-informed starting point. Track your weight over a couple of weeks and adjust your intake up or down based on the actual trend rather than assuming the first estimate is perfect.