Why TDEE varies so much between people
Two people can weigh the same, be the same age, and have completely different TDEEs. The reason comes down to five variables working together: height, weight, age, sex, and activity level. Change any one and your number shifts.
Height and weight drive the biggest differences. A taller, heavier body has more tissue to keep alive, so it burns more at rest. A 90kg person will have a higher resting burn than a 60kg person regardless of everything else. Weight is also the variable that changes most frequently, which is why TDEE is not a fixed number once calculated — it moves as you do.
Activity level is where most people get tripped up. The multipliers in TDEE calculations run from 1.2 for sedentary to 1.9 for extremely active, and that spread creates a difference of several hundred calories around the same base metabolic rate. A moderately active 75kg man and a sedentary 75kg man can easily differ by 500 kcal per day while both eating at "maintenance."
TDEE reference ranges by height and weight
The figures below use the Mifflin-St Jeor equation at a moderate activity level (multiplier 1.55). They are ballparks, not targets. Age shifts things — these are calculated for a 30-year-old. Every decade adds roughly a 2% reduction in resting burn.
| Height | 55 kg | 65 kg | 75 kg | 85 kg |
|---|---|---|---|---|
| 155 cm (5'1") | 1,820 kcal | 1,975 kcal | 2,130 kcal | 2,285 kcal |
| 165 cm (5'5") | 1,975 kcal | 2,130 kcal | 2,285 kcal | 2,440 kcal |
| 175 cm (5'9") | 2,130 kcal | 2,285 kcal | 2,440 kcal | 2,595 kcal |
| Height | 65 kg | 75 kg | 85 kg | 95 kg |
|---|---|---|---|---|
| 165 cm (5'5") | 2,195 kcal | 2,350 kcal | 2,505 kcal | 2,660 kcal |
| 175 cm (5'9") | 2,350 kcal | 2,505 kcal | 2,660 kcal | 2,815 kcal |
| 185 cm (6'1") | 2,505 kcal | 2,660 kcal | 2,815 kcal | 2,970 kcal |
These tables give you a ballpark. For a number based on your actual age, activity level, and goal, the TDEE calculator runs the full calculation in seconds.
Get your exact TDEE based on your stats →What counts as a normal TDEE?
For sedentary adults, TDEEs below 1,600 kcal are uncommon outside of smaller, older women. TDEEs above 3,500 kcal are uncommon outside of large, very active men. Most adults who exercise three to five days a week land somewhere between 1,900 and 2,800 kcal.
The numbers that genuinely surprise people usually have a simple explanation. Either their activity level is lower than they assumed — a desk job plus three gym sessions per week is "moderately active" at best, not "very active" — or their weight is doing more work than they realised. Someone who has lost 15kg will often be startled by how much their TDEE has dropped. That is not a broken metabolism. That is just a lighter body needing less fuel.
Once you know your TDEE, the question shifts from how much am I burning to what should I actually eat. Photo: Unsplash
Why your TDEE changes over time
TDEE is not a number you calculate once and file away. Three things shift it on a timeline that actually matters.
Weight changes. Every kilogram you lose lowers your BMR slightly, which lowers your TDEE. This is the main reason weight loss slows without any change to what you eat. The 500 kcal deficit you set up in month one has shrunk to 350 kcal by month three because your TDEE dropped along with your weight. Recalculate every four to six weeks.
Age. BMR declines roughly 1 to 2% per decade after your mid-20s, mostly because muscle mass naturally decreases. A 50-year-old generally burns 8 to 10% fewer calories at rest than they did at 30, at the same weight.
Activity level. Start a training programme and your TDEE goes up. Change from an active job to a desk job and it goes down. The activity multiplier is the fastest-moving variable in the equation and the one most people get wrong in both directions.
The Mifflin-St Jeor equation is accurate to within 10% for most people. That sounds imprecise until you consider that nutrition labels have a legal tolerance of 20% in most countries. Your TDEE estimate is actually one of the more reliable numbers in the whole process. When in doubt, go one activity level lower than you think you need.
Is a higher TDEE better?
It depends what you are optimising for. A higher TDEE means you can eat more and maintain weight, which most people find easier and more enjoyable. It also gives you more nutritional flexibility — hitting your protein, fibre, and micronutrient targets is far more manageable at 2,800 kcal than at 1,600 kcal.
The most reliable way to raise your TDEE is to build muscle. Muscle tissue burns roughly three times more calories at rest than fat tissue. This is why resistance training tends to make long-term weight management easier — it raises your baseline, and that effect persists even on rest days.
What to do with your TDEE once you have it
Knowing your TDEE only becomes useful when you eat relative to it. Eat consistently below it to lose weight, above it to gain, at it to maintain. The arithmetic is simple. What trips people up is assuming the number is static.
A practical approach: calculate your TDEE, set your intake accordingly, then weigh yourself daily and take a weekly average. If the average moves in the right direction, nothing needs changing. If it does not move after two to three weeks, your TDEE estimate is off. Drop the activity level one step and recalculate. Most of the time that is all it takes.
Once you have a working TDEE, the logical next step is understanding your macros. Knowing how many calories to eat answers how much. Knowing your protein, carb, and fat targets answers what. The macro calculator builds that picture on top of your TDEE in about thirty seconds.