Calorie Calculator
Determine daily caloric intake required to maintain, lose, or gain weight at a chosen pace.
Parameters & Inputs
Summary & Breakdown
Macro Recommendation (40/30/30 Split)
About the Calorie Calculator
Dietary energy balance governs body weight. Consuming more energy than you expend results in stored mass, while creating a sustained caloric deficit forces the human body to burn stored glycogen and body fat.
This calorie calculator evaluates your Basal Metabolic Rate (BMR) via the gold-standard Mifflin-St Jeor formula and multiplies it by your activity coefficient to find your Total Daily Energy Expenditure (TDEE).
Tailored targets are provided for steady weight loss, aggressive fat loss, or lean muscle growth.
How the Calculations Work
Calculates BMR via Mifflin-St Jeor equation, multiplies by physical activity factor for TDEE, and subtracts 500 kcal/day for ~1 lb (0.5 kg) weekly fat loss.
TDEE = BMR * Activity_Factor, Deficit = TDEE - 500 kcal
Variables & Definitions
- BMR: Basal Metabolic Rate at complete resting baseline
- Activity: Multiplier ranging from 1.2 (sedentary) to 1.9 (athletic)
- 500 kcal: Standard daily deficit yielding ~3,500 kcal weekly deficit (1 lb fat)
A 30-year-old male weighing 75 kg at 178 cm tall has a BMR of 1,732 kcal. With light activity (1.375), TDEE is 2,382 kcal. Consuming 1,882 kcal per day creates a 500 kcal deficit for 0.5 kg weekly fat loss.
Key Terms Explained
TDEE
Total Daily Energy Expenditure€”total calories burned over 24 hours including resting metabolism and movement.
Caloric Deficit
Consuming fewer calories than your body burns, initiating fat loss.
NEAT
Non-Exercise Activity Thermogenesis€”calories burned through fidgeting, standing, walking, and daily chores.
Thermic Effect of Food (TEF)
The energy required to digest and process food, highest for protein (~20-30%).
Practical Tips & Pitfalls to Avoid
Prioritize dietary protein
Eating 1.6 to 2.2 grams of protein per kilogram of body weight protects lean muscle during deficits.
Track food with a scale
Eyeballing portion sizes commonly underestimates calorie intake by 20% to 40%.
Avoid crash diets under 1,200 kcal
Extreme deficits trigger metabolic adaptation, lethargy, nutrient deficiencies, and muscle loss.
Increase daily steps
Adding 3,000 steps per day burns 100 to 150 calories without elevating exercise hunger.
Frequently Asked Questions
One pound of human body fat roughly equates to 3,500 stored dietary calories.
A deficit of 300 to 500 calories per day is sustainable and minimizes muscle loss and metabolic slowdown.
No. Total daily calorie and macronutrient balance dictates weight change, regardless of whether eaten in 2 or 6 meals.
As you lose weight, your BMR declines. Recalculate your calories every 10 pounds (5 kg) of weight loss.
Beginners and individuals with higher body fat can build muscle in a slight deficit with adequate protein and resistance training.