How many calories do you need? TDEE explained
Every day your body burns a specific number of calories just to stay alive and function. That number is your Total Daily Energy Expenditure, or TDEE. Knowing it is the foundation of any weight management plan.
The four components of TDEE
Basal metabolic rate (BMR) accounts for 60 to 75 percent of your daily calorie burn. This is the energy required to keep your heart beating, lungs breathing, and cells functioning at complete rest. BMR is driven mostly by your lean body mass. More muscle means a higher BMR.
Thermic effect of food (TEF) is the energy required to digest and process what you eat. It accounts for roughly 10 percent of TDEE. Protein has the highest thermic effect at 20 to 30 percent, meaning you burn more calories digesting protein than carbs or fat.
Physical activity includes everything from walking to the car to running a marathon. Non-exercise activity thermogenesis (NEAT) covers all the small movements of daily life — fidgeting, standing, walking between rooms. This varies hugely between individuals and can account for 100 to 800 calories per day.
Exercise activity thermogenesis (EAT) is the calorie burn from deliberate exercise. A 30-minute run might burn 300 to 500 calories depending on your weight and intensity.
How to find your TDEE
The most practical approach is to use an equation based on your age, sex, height, weight, and activity level. The Mifflin-St Jeor equation is widely considered the most accurate for the general population.
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
Multiply your BMR by an activity factor: 1.2 for sedentary, 1.375 for light activity, 1.55 for moderate activity, 1.725 for very active, and 1.9 for extremely active. The result is your estimated TDEE.
For a 180-pound, 5-foot-10, 30-year-old man with moderate activity, TDEE comes to roughly 2,800 calories per day. Eating that amount maintains weight. Eating below creates a deficit for weight loss. Eating above creates a surplus for weight gain.
Using TDEE for your goals
To lose one pound per week, create a 500-calorie daily deficit by eating less, moving more, or both. A 500-calorie deficit from a 2,800 TDEE means eating about 2,300 calories per day.
To gain muscle, a modest surplus of 200 to 300 calories per day is usually enough. Eating far above maintenance mostly adds fat, not muscle.
Use the TDEE Calculator to get your personalized number. Recalculate every 10 to 15 pounds of weight change since your BMR shifts as your body composition changes.
Common mistakes
Most people overestimate their activity level. If you have a desk job and work out three times per week, you are likely in the light activity category, not moderate. Overestimating activity leads to overestimating TDEE, which stalls weight loss.
TDEE is an estimate, not a precise measurement. Individual variation of plus or minus 200 calories is normal. Track your weight and intake for two weeks and adjust based on real-world results.