TDEE vs BMR: The Difference Explained With Real Examples
BMR and TDEE are the two most quoted calorie numbers in fitness, and confusing them is the number one reason calorie targets go wrong. Here is what each one means, how they connect, and which one to use for your goal.
BMR (basal metabolic rate) is the calories your body burns at complete rest to stay alive. TDEE (total daily energy expenditure) is BMR plus all calories from exercise, daily movement, and digesting food. TDEE is the number to use for setting calorie targets; BMR is just the starting point.
BMR: what your body burns just staying alive
Your basal metabolic rate is the energy cost of keeping you running while you do nothing: breathing, circulating blood, maintaining body temperature, and repairing cells. For most adults, BMR accounts for roughly 60 to 70 percent of all calories burned in a day.
BMR depends mostly on your size, age, and sex. Bigger bodies cost more energy to maintain. Muscle tissue burns more at rest than fat tissue, which is one reason two people of the same weight can have different BMRs. BMR slowly falls with age, roughly 1 to 2 percent per decade after age 20, partly because muscle mass tends to decline.
TDEE: BMR plus everything you do
TDEE stacks three layers of calorie burn on top of BMR:
First, exercise activity: the calories you burn in workouts, sports, and training sessions. Second, daily movement: everything else you do on your feet, walking, cleaning, fidgeting, and commuting. This layer is called NEAT (non-exercise activity thermogenesis), and it varies enormously between people. Third, the thermic effect of food: roughly 10 percent of the calories you eat go to digesting and processing them. Protein costs the most to digest, at 20 to 30 percent of its calories, while fat costs only 0 to 3 percent.
That is why TDEE is the number that matters for calorie targets. Two people can share an identical BMR and end up with TDEEs that differ by 800 calories or more, purely because one is on her feet all day and the other sits at a desk. To learn how each layer works in detail, read what TDEE actually measures.
How BMR and TDEE are calculated
BMR comes from a prediction equation. The most validated one is Mifflin-St Jeor:
Men: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) + 5
Women: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) - 161
TDEE comes from multiplying BMR by an activity factor that reflects your routine:
Sedentary (little or no exercise): BMR x 1.2
Lightly active (exercise 1 to 3 days a week): BMR x 1.375
Moderately active (exercise 3 to 5 days a week): BMR x 1.55
Very active (hard exercise 6 to 7 days a week): BMR x 1.725
Extra active (physical job or training twice a day): BMR x 1.9
Worked example: the same BMR, two different TDEEs
Take a 35 year old man, 180 cm tall, 80 kg:
BMR = (10 x 80) + (6.25 x 180) - (5 x 35) + 5
= 800 + 1125 - 175 + 5
= 1755 calories per day
If he works a desk job and barely exercises, his TDEE is 1755 x 1.2 = 2106 calories per day.
If instead he trains hard six days a week, his TDEE is 1755 x 1.725 = 3027 calories per day.
Same BMR, same body, but the two routines differ by 921 calories a day. That is the gap that confuses people: they plug their stats into a calculator, pick the wrong activity level, and end up eating 900 calories too many or too few. Our guide to calculating TDEE by hand walks through choosing the right multiplier.
A second example, a 28 year old woman, 165 cm, 60 kg:
BMR = (10 x 60) + (6.25 x 165) - (5 x 28) - 161
= 600 + 1031.25 - 140 - 161
= 1330 calories per day
Moderately active, her TDEE is 1330 x 1.55 = 2062 calories per day.
Which number should you eat at?
Almost never your BMR. BMR is the floor for your organs, and dieting at or below it for long stretches is hard to sustain and can cost you muscle. The practical uses are:
To lose fat, eat below your TDEE, typically 300 to 500 calories under it. That produces about 0.5 to 1 pound of fat loss per week. To maintain weight, eat at your TDEE. To gain muscle, eat 250 to 500 calories above your TDEE. See how many calories to eat for your goal for the full breakdown with numbers.
Use BMR as the sanity check it is: your TDEE should always be larger than your BMR, and if a calculator shows otherwise, something is wrong. Then work from TDEE for everything else.
Get your own numbers
Reading about the math is useful. Running your own stats through it is better. Our free calculator estimates your BMR with the Mifflin-St Jeor equation and your TDEE from your activity level, then gives you calorie targets for losing, maintaining, or gaining weight.
TDEE vs BMR questions
Should I eat my BMR or TDEE?
Eat relative to your TDEE, not your BMR. Your TDEE is your total daily burn, so it is the number that tells you what a deficit or surplus actually is. Eating at BMR means you are running a large deficit every day, which works only for short, planned phases and usually costs muscle if it goes on too long.
If my BMR is 1500, what is my TDEE?
It depends on your activity level. With a BMR of 1500: sedentary gives 1500 x 1.2 = 1800; lightly active gives 1500 x 1.375 = 2063; moderately active gives 1500 x 1.55 = 2325; very active gives 1500 x 1.725 = 2588; extra active gives 1500 x 1.9 = 2850. Pick the activity level that matches your actual routine, not your aspirations.
How many calories should I eat if my BMR is 1200?
Find your TDEE first, then subtract for fat loss. With a BMR of 1200, a moderately active person has a TDEE of 1200 x 1.55 = 1860. A 500 calorie daily deficit puts her at 1360 calories per day for roughly one pound of fat loss per week. Eating at 1200 itself would be a 660 calorie deficit, which is aggressive and best kept short.
Why is my BMR only 1000 calories?
A low BMR usually means a small, light body, an older age, or both. A 60 year old woman at 150 cm and 55 kg might genuinely have a BMR near 1100. It does not mean anything is broken. It just means her TDEE is also lower, so calorie targets need to be tighter and food choices need to be nutrient dense.