A TDEE calculator is a nutritional science tool that estimates your Total Daily Energy Expenditure—the total number of calories your body burns in a 24-hour cycle. It accounts for your Basal Metabolic Rate (BMR), unconscious movement (NEAT), structured exercise (EAT), and the thermic effect of food (TEF) to determine your daily energy needs.

Maintenance calories are the exact number of daily calories required to maintain your current body weight. When you consume your maintenance calories, your energy intake matches your energy output, creating an isocaloric state where you neither gain body fat nor lose lean muscle mass.

Your calorie maintenance is your individual Total Daily Energy Expenditure (TDEE). For example, if your body burns 2,200 calories per day through resting metabolism and daily activity, your daily calorie maintenance is 2,200 kcal. Eating at this exact amount keeps your body weight steady.

Your calorie maintenance is calculated based on your age, biological sex, height, body weight, lean muscle mass, and daily activity level. Because body weight and activity levels change over time, your calorie maintenance is dynamic and will naturally shift as you gain or lose weight.

To figure out your maintenance calories, first use our TDEE calculator to establish an evidence-based baseline. Next, eat at that caloric target for 2 to 3 weeks while weighing yourself every morning. If your average weekly weight remains steady, that number is your true maintenance calorie level.

To calculate calorie maintenance manually, first determine your Basal Metabolic Rate (BMR) using an established formula such as Mifflin-St Jeor. Then, multiply your BMR by your physical activity multiplier (1.2 for sedentary, 1.375 for lightly active, 1.55 for moderately active, 1.725 for very active, or 1.9 for extremely active). The final number is your daily maintenance calories.

To calculate maintenance calories in metric units (kg and cm), use the standard Mifflin-St Jeor formula: For men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5. For women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161. Next, multiply this BMR value by your weekly activity factor (1.2 to 1.9) to find your maintenance calories.

The universal TDEE formula is: TDEE = BMR × Activity Factor. BMR is computed using clinical equations like Mifflin-St Jeor or Katch-McArdle (which uses lean body mass). The activity factor ranges from 1.2 (desk job with minimal movement) up to 1.9 (hard daily training or demanding physical labor).

To lose weight, your target calorie intake should be 300 to 500 calories below your calculated maintenance TDEE (a moderate 15% to 20% deficit). For example, if your maintenance TDEE is 2,400 kcal per day, eating 1,900 to 2,100 kcal per day will produce steady, healthy fat loss without sacrificing energy or muscle mass.

To use TDEE for fat loss, first calculate your daily maintenance calories. Next, subtract 300 to 500 kcal to establish a sustainable caloric deficit. Pair this deficit with a high-protein diet (1.6 to 2.2 grams per kg of body weight) and progressive resistance training to ensure weight lost is predominantly body fat rather than lean muscle.

Burning 1 kilogram of body fat requires a cumulative energy deficit of approximately 7,700 kcal (equivalent to about 3,500 kcal per pound of fat). Sustaining a daily deficit of 500 kcal below your TDEE will result in losing roughly 1 kg of fat every 15 to 16 days.

While you may lose 2 kg on the scale during your first week of dieting due to water and glycogen depletion, losing 2 kg of actual body fat in one week is neither realistic nor healthy. Burning 2 kg of fat requires an extreme 15,400 kcal deficit (2,200 kcal/day deficit), which risks muscle breakdown, lethargy, and nutrient deficiencies. A safe, sustainable target is 0.5 to 1 kg per week.

Yes, almost all adults will lose weight on 1,200 calories a day because it creates a significant deficit below typical human energy needs. However, for most adults and active individuals, 1,200 calories is too low and can trigger hormonal slowdown, muscle loss, chronic fatigue, and rebound binge eating. It is safer to calculate your personal TDEE and apply a moderate deficit.

An intake of 1,200 to 1,500 calories per day may be appropriate for small, sedentary women, but it is typically insufficient for men, taller individuals, and active people whose resting metabolic rate (BMR) alone often exceeds 1,500 kcal. Your calorie floor should always be determined by your personalized TDEE rather than arbitrary targets.

Walking 10,000 steps burns approximately 300 to 500 calories, depending on your body weight, walking pace, and elevation. For example, an individual weighing 70 kg (154 lbs) typically burns around 350 to 400 calories by walking 10,000 steps, making it an exceptional tool for daily non-exercise activity (NEAT).

Yes. Burning 500 calories a day through physical movement—such as walking 8,000 to 10,000 steps plus light daily activity—typically aligns with the 'Lightly Active' to 'Moderately Active' tier on a TDEE calculator (representing an activity multiplier of approximately 1.375 to 1.5).

Yes, burning 400 calories a day through physical exercise and daily movement is an excellent, sustainable goal for cardiovascular health, metabolic efficiency, and fat loss. It helps create a healthy energy deficit without overstressing your joints or nervous system.

Burning 1,500 calories purely through exercise in a single day is very demanding and generally only safe for competitive endurance athletes with substantial nutritional support and recovery protocols. If you mean creating a 1,500-calorie daily deficit, that is too aggressive for most individuals and leads to muscle loss and extreme fatigue.