TDEE Calculator: How Many Calories Do You Actually Burn Per Day?
TDEE is the total number of calories your body burns in a typical day — everything from breathing and digestion to exercise and fidgeting. It's the number that determines whether you gain, lose, or maintain weight.
Eat more than your TDEE consistently: you gain weight.
Eat less than your TDEE consistently: you lose weight.
Eat at your TDEE: your weight is stable.
This is basic physics. The reason it feels complicated is that TDEE is hard to measure and easy to estimate wrong.
The Components of TDEE
Basal Metabolic Rate (BMR): The calories you burn at complete rest — for breathing, circulation, cell repair, and maintaining body temperature. This is 60-75% of most people's total calorie burn.
Thermic Effect of Food (TEF): Digesting and metabolizing food costs calories — roughly 10% of total calories consumed. Protein costs more to digest than carbs or fat.
Non-Exercise Activity Thermogenesis (NEAT): Fidgeting, walking, standing, household tasks. This varies enormously between people — from 200 calories/day for very sedentary people to 1,200/day for active ones. NEAT is why two people with identical exercise habits can have very different calorie burns.
Exercise Activity Thermogenesis (EAT): The calories burned during deliberate exercise. Most people overestimate this — a 45-minute moderate run burns 350-500 calories, not the 800 many assume.
Why Most Estimates Are Wrong
Fitness tracker estimates tend to be too high by 20-40%. Self-reported activity levels are almost always optimistic. When in doubt, start with the calculated estimate and adjust based on actual weight changes over 2-3 weeks.
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Frequently Asked Questions
Why is my fitness tracker's calorie burn estimate so different from this calculator?
Fitness trackers typically overestimate calorie burn by 20-40% because they can't accurately measure NEAT (fidgeting, daily movement) or account for individual differences in metabolism. This calculator uses your actual activity level as input rather than relying on sensor data, making it more reliable as a starting point — though you should always adjust based on real weight changes over 2-3 weeks.
How much does exercise actually contribute to my total daily calorie burn?
Most people overestimate exercise's impact on TDEE. A 45-minute moderate run burns only 350-500 calories, not the 800 many assume. For most people, exercise (EAT) is just 5-15% of total daily burn — your BMR and NEAT matter much more, which is why two people with identical workouts can have very different calorie needs.
Should I use a different TDEE number if I'm sedentary versus active?
Yes — NEAT varies enormously between individuals, ranging from 200 calories/day for very sedentary people to 1,200/day for active ones. This calculator accounts for your activity level to estimate your actual TDEE. If your job involves sitting all day but you exercise regularly, make sure you select the activity level that matches your total daily movement, not just your workouts.
Why does my calculated TDEE seem too high if I'm not losing weight while eating less?
Your estimate is likely still too optimistic about how much you're actually eating or moving. Self-reported activity levels are almost always overestimated. Use the calculator as a starting point, then eat at that number for 2-3 weeks and track your actual weight changes — if you're not losing weight at a deficit, your true TDEE is lower and you should reduce calories by 200-300/day.
This article is for informational purposes only. See our disclaimer.