TDEE Calculator

TDEE stands for Total Daily Energy Expenditure. It is the total number of calories your body burns in a 24-hour period. This includes everything from breathing and pumping blood (your Basal Metabolic Rate) to walking, exercising, digesting food, and even fidgeting.

Understanding your TDEE is the foundation of any effective nutrition plan. Whether your goal is fat loss, muscle gain, or simply maintaining your current weight, knowing how many calories you actually burn gives you a concrete starting point for setting daily targets.

Without knowing your TDEE, calorie goals are just guesses. A 1,500-calorie diet could be perfect for one person and dangerously low for another. A 2,500-calorie diet might cause weight gain in a sedentary person but lead to weight loss in a very active one. TDEE gives you the number that makes everything else make sense.

TDEE is calculated in two steps. First, you determine your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest just to keep you alive. Then you multiply your BMR by an activity factor that accounts for your daily movement and exercise.

This calculator uses the Mifflin-St Jeor equation, which is considered the most accurate widely-used formula for estimating BMR. Published in 1990, it has been validated in numerous studies and is recommended by the Academy of Nutrition and Dietetics.

The equation accounts for the fact that men typically have more lean mass and a higher metabolic rate than women of the same weight and height. Age is also factored in because metabolism naturally slows as we get older — roughly 1–2% per decade after age 20.

The activity multiplier is what turns your resting metabolism (BMR) into your total daily calorie burn (TDEE). Choosing the right level is critical — overestimating your activity is the most common mistake people make when calculating TDEE.

• Sedentary (1.2): You work at a desk, drive to work, and do not exercise regularly. Most office workers fall here, even if they walk 3,000–5,000 steps per day.
• Lightly Active (1.375): You exercise 1–3 times per week at a moderate intensity, or you have a job that involves some walking (teacher, retail). This includes people who walk 7,000–10,000 steps daily.
• Moderately Active (1.55): You exercise 3–5 times per week with moderate to high intensity. This is the most common level for regular gym-goers who also have a somewhat active daily routine.
• Very Active (1.725): You train hard 6–7 days per week, or you combine a physically demanding job with regular exercise. Athletes in training seasons often fall in this category.
• Extra Active (1.9): You perform very intense exercise daily (twice a day or long sessions), or you have an extremely physical job combined with regular training. This level is rare and applies mainly to competitive athletes and manual laborers.

Tip: When in doubt, choose one level lower than you think. Most people overestimate their activity. You can always adjust upward if you find yourself losing weight too quickly.

Once you know your TDEE, setting a calorie target is straightforward. Your TDEE is your maintenance level — eating this many calories keeps your weight stable. To change your weight, you create a calorie surplus or deficit relative to this number.

For Weight Loss

A deficit of 500 calories per day below your TDEE results in approximately 0.45 kg (1 lb) of fat loss per week. This is considered a safe and sustainable rate for most people. Larger deficits (750–1,000 cal/day) can be used short-term but increase the risk of muscle loss, nutrient deficiencies, and metabolic adaptation.

Never go below 1,200 calories per day (women) or 1,500 calories per day (men) without medical supervision. If a 500-calorie deficit puts you below these floors, reduce the deficit or increase activity instead.

For Muscle Gain

To build muscle, eat 300–500 calories above your TDEE. This provides the energy surplus your body needs to synthesize new muscle tissue. Combine this with a structured resistance training program and adequate protein intake (1.6–2.2 g per kg of body weight).

Larger surpluses do not build muscle faster — they just increase fat gain. A lean bulk with a modest surplus of 200–300 calories is often more effective than a traditional bulk for people who want to minimize fat gain.

For Maintenance

Eating at your TDEE keeps your weight stable. This is the right target during diet breaks, reverse dieting phases, or when your primary goal is performance rather than body composition changes. Even at maintenance, tracking helps you hit your protein and micronutrient targets.

Calculating your TDEE is the first step. The second — and harder — step is consistently tracking your intake against that target. This is where most people fail: manual calorie counting is tedious, error-prone, and easy to abandon.

Kcaly AI eliminates the friction. Just send a photo of your meal on WhatsApp and the AI identifies every food item, estimates portions using USDA-verified nutrition data, and logs the calories, protein, fat, and carbs automatically. No barcode scanning, no searching databases, no weighing food.

When you set up your profile, Kcaly AI calculates your TDEE based on your stats and goal. Your daily calorie target is set accordingly — with a deficit for fat loss, surplus for muscle gain, or at maintenance. The dashboard shows your progress in real time: how many calories you have eaten, how many remain, and whether you are on track.

Over time, Kcaly AI learns from your actual results. If you are consistently losing or gaining weight faster or slower than expected, the system can suggest target adjustments — because real-world TDEE varies based on factors no formula can capture, like Non-Exercise Activity Thermogenesis (NEAT), sleep quality, and stress.