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Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a day, accounting for all activities — from sleeping and digestion to exercise and work. While BMR represents the calories you burn at rest, TDEE adds the energy cost of your actual lifestyle, making it the most practically useful number for planning a diet or fitness program.
TDEE is calculated by multiplying your BMR by an activity factor that reflects how physically active you are throughout the day. These factors, commonly known as the Harris-Benedict activity multipliers, range from 1.2 (sedentary, desk job, no exercise) to 1.9 (very physically demanding job combined with intense daily training). Choosing the right multiplier requires honest self-assessment — most people overestimate their activity level, which leads to eating too much and slow weight gain.
Understanding your TDEE empowers you to make informed decisions about your caloric intake. To lose weight, you need to eat fewer calories than your TDEE (a deficit of 500 cal/day results in approximately 1 lb/week of loss). To gain weight or build muscle, you need a caloric surplus. To maintain weight, you eat at your TDEE. This calculator uses the Mifflin-St Jeor equation for BMR — the most accurate formula for the general population — to give you the most reliable TDEE estimate possible.
TDEE is the product of your Basal Metabolic Rate and your activity factor:
$$TDEE = BMR \times Activity\ Factor$$
The BMR is first calculated using the Mifflin-St Jeor equation:
Males: $$BMR = 10W + 6.25H - 5A + 5$$
Females: $$BMR = 10W + 6.25H - 5A - 161$$
Where $$W$$ = weight in kg, $$H$$ = height in cm, $$A$$ = age in years. The activity multipliers are: Sedentary = 1.2, Light activity = 1.375, Moderate activity = 1.55, Active = 1.725, Very active = 1.9. The resulting TDEE represents your estimated daily calorie maintenance level — the exact number of calories needed to keep your current weight stable given your activity pattern.
Your TDEE is your calorie maintenance level. To lose approximately 1 pound per week, subtract 500 calories from your TDEE daily. To lose 2 pounds per week (the maximum typically recommended), subtract 1,000 calories — but never go below your BMR. To build muscle with minimal fat gain, add 200–300 calories above TDEE. The accuracy of your TDEE estimate depends heavily on correctly identifying your activity level — when in doubt, start with a lower activity multiplier and adjust based on real-world results over 2–4 weeks.
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To lose 1 lb/week, this man should eat approximately 2,538 calories/day. To gain muscle, he could eat 3,238–3,338 calories/day.
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For a 1 lb/week weight loss, this woman should target approximately 1,516 calories/day while maintaining her current activity level.
TDEE calculators provide estimates with typical accuracy of ±10–15%. Individual factors like hormonal health, gut microbiome, sleep quality, and genetics can cause actual TDEE to deviate from predictions. The best approach is to track calories at the calculator's maintenance estimate for 2 weeks and adjust based on whether your weight is changing.
You don't need to hit your TDEE exactly each day — what matters most is your average caloric intake over a week. Many people find it sustainable to eat slightly under TDEE on weekdays and closer to maintenance on weekends. Consistency over weeks and months drives results more than hitting a precise daily number.
Common reasons include: overestimating the activity multiplier, underestimating caloric intake (studies show most people undercount calories by 20–40%), not accounting for liquid calories, or adaptive thermogenesis (metabolic slowdown during dieting). Reassessing your activity level and tracking food more carefully are the first steps.
Yes. TDEE changes as your weight changes, as you age, and as your activity level fluctuates. When you lose weight, your TDEE decreases because you are carrying less mass. This is why you should recalculate your TDEE every 10–15 lbs of weight change and adjust your calorie targets accordingly.
Yes — for most practical purposes, TDEE and maintenance calories are the same thing. Eating exactly at your TDEE should result in stable weight over time (accounting for normal water weight fluctuations of 1–3 lbs).
If you have a completely sedentary job but exercise consistently 4 times per week with moderate-to-high intensity, the Moderate multiplier (1.55) is typically most appropriate. If your workouts are very intense (e.g., heavy weight training or HIIT for 60+ minutes), consider the Active multiplier (1.725) and monitor your weight weekly to validate.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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