TDEE Calculator

1.1 Choose Unit System

• Metric (kg / cm)
• Imperial (lbs / inches)

1.2 Enter Personal Details

• Gender
• Age
• Height
• Weight

1.3 Choose Activity Level

• Sedentary
• Light Exercise
• Moderate Exercise
• Heavy Exercise
• Athlete

1.4 View Results

• Click the Calculate button
• Estimated daily maintenance calories
• Calories for weight loss or weight gain
• Recommended protein, fats, and carbs
• Activity-based calorie chart
• Use the Reset button anytime to clear all values and start over

2.1 Accurate BMR Calculation

The tool uses a widely accepted metabolic formula to estimate your Basal Metabolic Rate, which represents the calories your body burns at rest.

2.2 Daily Calorie Estimation

Your BMR is multiplied by your selected activity level to generate your TDEE, giving a realistic estimate of your daily calorie needs.

2.3 Weight Goal Planning

The calculator provides calorie targets for:

• Mild weight loss
• Moderate weight loss
• Mild weight gain
• Moderate weight gain

This helps you create a practical nutrition strategy.

2.4 Macronutrient Breakdown

You can view multiple macro plans including:

• Moderate carb
• Lower carb
• Higher carb
• Protein
• Fat
• Carbohydrates

2.5 Interactive Activity Chart

A visual bar chart displays how your calorie needs change depending on your activity level, making the results easier to understand.

2.6 Responsive Design

• Mobile phones
• Tablets
• Desktop screens

4.1 Caloric Deficit Weight Loss

Establish a sustainable calorie deficit (typically 300 to 500 kcal per day) to burn body fat consistently while preserving active lean muscle tissue.

4.2 Hypertrophy & Lean Muscle Gain

Determine your baseline maintenance needs and apply a controlled caloric surplus (200 to 300 kcal daily) to fuel progressive resistance training and recovery.

4.3 Athletic Conditioning & Endurance

Calculate high energy demands for runners, cyclists, and team sport athletes to ensure adequate glycogen replenishment and prevent relative energy deficiency.

4.4 Metabolic Health & Maintenance

Track adjustments in energy expenditure as routines change—such as shifting from sedentary office work to active lifestyle habits—to maintain optimal body weight.

5.1 What is the difference between BMR and TDEE?

Basal Metabolic Rate (BMR) represents the baseline energy your body requires to keep vital organs functioning at complete rest. Total Daily Energy Expenditure (TDEE) accounts for BMR plus physical movement, deliberate exercise, and the thermic effect of digesting food.

5.2 Which mathematical formula is used to estimate BMR?

ZenUtilify uses the clinically validated Mifflin-St Jeor equation, which estimates resting metabolic rate accurately using your gender, age, height, and weight.

5.3 How should I select my activity multiplier?

Choose 'Sedentary' for desk work with minimal exercise. Choose 'Light Exercise' for 1-3 weekly workouts, 'Moderate' for 3-5 sessions, 'Heavy' for 6-7 strenuous workouts, and 'Athlete' for twice-daily training or physically demanding occupations.

5.4 Is my personal biometric data stored or shared?

No. All metabolic and macronutrient calculations execute entirely in your web browser. No personal inputs (age, height, weight, or gender) are stored, logged, or sent to any server.