Calorie Calculator
Find your optimal daily calorie intake for weight loss, maintenance, or muscle gain.
Calories/day to maintain current weight
Understanding Your Calorie Needs
Every person requires a different amount of calories to sustain cellular function, support physical activity, and maintain their current body weight. This total daily calorie requirement is known as your Total Daily Energy Expenditure (TDEE). By understanding your TDEE, you can strategically adjust your food intake to achieve your specific body composition goals—whether that means losing body fat, building muscle, or simply maintaining your current physique.
How The Calorie Calculator Works
Our calorie calculator utilizes the highly accurate Mifflin-St Jeor equation, which is widely considered by health professionals to be the most reliable metric for estimating basal metabolic rate (BMR). Once it determines your BMR, it applies an activity multiplier based on your self-reported exercise levels to find your TDEE.
- Basal Metabolic Rate (BMR): The amount of calories your body burns at rest just to keep you alive (breathing, pumping blood, brain function).
- Thermic Effect of Food (TEF): The calories burned digesting the food you eat.
- Non-Exercise Activity Thermogenesis (NEAT): Calories burned through spontaneous movements, walking to your car, fidgeting, etc.
- Exercise Activity Thermogenesis (EAT): The calories burned through intentional workouts and sports.
The Science of Weight Loss (Caloric Deficit)
To lose weight, you must consume fewer calories than your TDEE. This state is called a caloric deficit. Because a single pound of body fat contains approximately 3,500 calories of stored energy, the standard medical advice for weight loss is to establish a 500-calorie daily deficit. Over the course of 7 days, this results in a total deficit of 3,500 calories, or exactly 1 pound of fat loss per week.
Our calculator automatically deducts these 500 calories from your maintenance number to provide your ideal weight loss target.
The Science of Muscle Gain (Caloric Surplus)
Conversely, in order to build significant amounts of new muscle tissue (hypertrophy), the body requires a surplus of energy and building materials (protein). A caloric surplus provides the necessary fuel for muscle synthesis. However, if the surplus is too large, the excess energy will be stored as fat. Therefore, a controlled "lean bulk" of 250 to 500 calories above your maintenance TDEE is heavily recommended for optimal athletic results.
Activity Level Multipliers Reference
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | BMR × 1.2 | Office job, mostly sitting, no intentional exercise. |
| Lightly Active | BMR × 1.375 | Light exercise or sports 1-3 days per week. |
| Moderately Active | BMR × 1.55 | Moderate exercise or sports 3-5 days per week. |
| Very Active | BMR × 1.725 | Hard exercise or sports 6-7 days per week. |
| Extra Active | BMR × 1.9 | Very hard physical labor job or training twice a day. |