Calorie Calculator
Calculate daily calorie intake for weight loss (-500 kcal), maintenance, or muscle gain.
Input Parameters
Live Result
Details
Steps
Calculate Basal Metabolic Rate (BMR) via Mifflin-St Jeor equation
Calculate Total Daily Energy Expenditure (TDEE) with activity multiplier
Apply caloric target according to training and body composition goal
Distribute daily macronutrients (Carbohydrates, Protein, Dietary Fat)
Quick Answer & Understanding Your Result
A Calorie calculator determines the total number of dietary kilocalories (kcal) you need to consume each day to maintain, lose, or gain body weight based on your metabolic energy expenditure.
The 3 Core Caloric Target Zones
- Maintenance (Zero Weight Change): Consume 100% of your TDEE calories.
- Fat Loss Deficit (0.5 kg / 1 lb per week): Consume TDEE - 500 kcal/day (3,500 kcal deficit total per week).
- Lean Muscle Surplus (Bulking): Consume TDEE + 300 to 500 kcal/day with progressive strength training.
Energy Density of Macronutrients
- Protein: 4 calories per gram (supports muscle protein synthesis and satiety).
- Carbohydrates: 4 calories per gram (primary fuel for high-intensity muscular work).
- Fats: 9 calories per gram (essential for hormone synthesis and vitamin absorption).
Enter your weight, height, age, and activity level above to calculate your personalized daily caloric budget.
Formula & Calculation Logic
Mathematical FormulaCalculates maintenance TDEE via Mifflin-St Jeor and adjusts by target caloric deficit or surplus.
Step-by-Step Guide
Enter Physical Stats
Input age, gender, height, and weight.
Select Activity Level
Choose your weekly exercise frequency.
Choose Target Goal
Select Maintain, Mild Weight Loss (-250 kcal), Weight Loss (-500 kcal), or Muscle Gain (+300 kcal).
Receive Calorie Budget
View daily calorie intake targets and meal breakdown recommendations.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Male Fat Loss Plan (TDEE 2,500 kcal) | Will produce approximately 0.5 kg (1 lb) of fat loss per week. | ||
| Female Lean Bulk (TDEE 1,800 kcal) | Provides energy for muscle growth while minimizing excess fat gain. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
USDA Dietary Guidelines for Americans
Academy of Nutrition and Dietetics
Standard: WHO Adult BMI Diagnostic Standard
Formula: Daily Calories = TDEE ± Goal Adjustment
Last Reviewed: August 21, 2026
Primary Source: USDA Dietary Guidelines for Americans
Reference Document: Academy of Nutrition and Dietetics
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated health, metabolic, and biometric metrics are for general fitness and educational reference only. They do not substitute for professional medical advice, clinical diagnosis, or personalized treatment plans.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.