TDEE Calculator — Total Daily Energy Expenditure

About the TDEE Calculator — Total Daily Energy Expenditure

Your Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period, including basal metabolism, physical activity, the thermic effect of food, and non-exercise activity thermogenesis (NEAT). TDEE is a useful reference point for calorie-based planning — eat below it to lose weight, near it to maintain, or above it to gain.

This TDEE calculator computes your Basal Metabolic Rate using up to four commonly used equations — Mifflin-St Jeor, Harris-Benedict (Revised), Katch-McArdle, and Cunningham — then multiplies by your activity level to give a broader picture of daily calorie needs. By comparing multiple formulas, you can bracket a plausible estimate rather than relying on a single equation.

Whether you are planning a caloric deficit for fat loss, eating for athletic performance, or reverse dieting after a prolonged cut, knowing your TDEE gives you a practical starting estimate. Enter your details below to get started.

When This Page Helps

Estimating calorie needs by guesswork often leads to over- or under-eating. A TDEE calculator gives you a structured starting estimate based on body size and activity level. This one shows results from multiple BMR formulas side by side so you can compare the range of estimates and choose a practical starting point for your situation.

How to Use the Inputs

1. Select your biological sex (male or female).
2. Choose your preferred unit system — metric or imperial.
3. Enter your height, weight, and age accurately.
4. Optionally enter your body fat percentage for Katch-McArdle and Cunningham calculations.
5. Select the activity level that best describes your typical week.
6. View your TDEE from multiple formulas in the comparison table.
7. Check the goal-based calorie targets for cutting, maintenance, and bulking.
8. Use the macronutrient distribution guide to plan your protein, carb, and fat intake.

Example Calculation

Tips & Best Practices

• Your TDEE is an estimate — track your weight for 2-4 weeks eating at the calculated level, then adjust by 250-500 kcal based on actual results.
• A 500 kcal/day deficit below TDEE approximately equals 0.45 kg (1 lb) of weight loss per week.
• Most people overestimate their activity level — when in doubt, choose one level lower.
• Non-exercise activity thermogenesis (NEAT) — fidgeting, walking, standing — can account for 200-900 kcal/day variation between people.
• The thermic effect of food (TEF) is approximately 10% of total caloric intake and is already factored into activity multipliers.
• If you enter your body fat percentage, the lean-mass-based formulas (Katch-McArdle, Cunningham) will provide additional estimates.
• During weight loss plateaus, recalculate TDEE with your current weight — it decreases as you get lighter.
• Weekend calorie intake often exceeds weekday intake by 10-20% for many people — factor this into weekly planning.

Components of TDEE

TDEE is the sum of four components: Basal Metabolic Rate (60-70% of TDEE), Thermic Effect of Food (approximately 10%), Non-Exercise Activity Thermogenesis or NEAT (15-30%), and Exercise Activity Thermogenesis or EAT (5-10% for sedentary people, up to 30% for athletes). Understanding these components helps explain why two people of similar size can have very different calorie needs.

Why Multiple Formulas Matter

No single BMR equation is perfect for everyone. Mifflin-St Jeor was validated on modern mixed populations and is commonly used. Harris-Benedict has decades of usage but tends to estimate slightly higher. Katch-McArdle and Cunningham can be useful for people who know their body composition. By presenting all four results, this calculator helps you bracket a reasonable TDEE range rather than relying on a single formula.

Building a Sustainable Nutrition Plan

Start by eating near your calculated TDEE for two weeks while tracking weight daily. Compute a weekly average weight to smooth out daily fluctuations from water, sodium, and glycogen. If weight is stable, you have a better sense of your maintenance level. Then apply your deficit or surplus. For every subsequent 5-10 kg of weight change, recalculate. This iterative approach is usually more useful than setting a calorie level once and never revisiting it.

Common Mistakes When Using TDEE

A common mistake is overestimating activity level, which inflates TDEE and can stall fat loss. Another is not recalculating after significant weight changes. Ignoring liquid calories, cooking oils, and weekend eating can also add substantial untracked intake. Aggressive deficits may work briefly for some people but are often harder to sustain than more moderate approaches.

Frequently Asked Questions

• What is the best way to estimate TDEE?

  The most direct reference methods are indirect calorimetry combined with doubly labeled water, but these are expensive and impractical for most people. For everyday use, equations such as Mifflin-St Jeor provide a reasonable starting BMR estimate for many adults. Multiply by an activity factor, then refine the estimate by tracking weight changes over 2-4 weeks.

• Which BMR formula should I use?

  Use Mifflin-St Jeor if you don't know your body fat percentage — it is one of the most commonly used formulas for general populations. If you know your body fat, Katch-McArdle can be a helpful lean-mass-based comparison, while Cunningham is often discussed in athletic settings. Harris-Benedict is provided for historical comparison and tends to estimate slightly higher.

• How much should I eat to lose weight safely?

  A deficit of 500-750 kcal below TDEE is a common starting point and often leads to about 0.5-0.7 kg (1-1.5 lb) of weight loss per week in many adults. Larger deficits can be harder to sustain and may increase the risk of fatigue or lean-mass loss. If intake is being pushed very low, individual supervision matters.

• How do I choose the right activity level?

  Sedentary: office work, minimal exercise. Lightly active: 1-3 light exercise sessions per week or a job with some walking. Moderately active: 3-5 moderate workouts per week. Very active: intense daily training. Extra active: competitive athletes or very physically demanding jobs with additional exercise. If unsure, start lower and adjust upward.

• Does TDEE change as I lose weight?

  Yes. As you lose weight, your TDEE decreases because there is less body mass to support. Additionally, metabolic adaptation (your body becoming more efficient) can reduce TDEE by another 5-15% beyond what weight change alone would predict. Recalculate every 5-10 kg of weight change.

• What is metabolic adaptation?

  Metabolic adaptation (sometimes called "metabolic slowdown") is a physiological response to sustained caloric restriction where your body reduces energy expenditure beyond what would be expected from weight loss alone. Mechanisms include reduced NEAT, lower thyroid hormone output, and improved metabolic efficiency. Diet breaks and reverse dieting can help mitigate this effect.

• Can I eat more on workout days and less on rest days?

  Yes, calorie cycling is a valid approach. Many people eat at TDEE or slightly above on training days and reduce intake on rest days, keeping the weekly average at their target. This can improve performance during workouts while maintaining the desired overall deficit or surplus.

• How does TDEE relate to macronutrients?

  TDEE tells you the total calories to consume; macronutrients determine how those calories are distributed. A common starting point is 1.6-2.2 g protein per kg body weight, 0.7-1.2 g fat per kg, with remaining calories from carbohydrates. Protein and carbs provide 4 kcal/g while fat provides 9 kcal/g.