TDEE vs BMR: What’s the Difference and Which to Use?

BMR (basal metabolic rate) is the energy your body burns at complete rest. TDEE (total daily energy expenditure) is everything you burn in a day, including movement, exercise and digestion. For a lightly active 35-year-old woman who weighs 65 kg and is 165 cm tall, BMR is about 1,350 kcal and TDEE is about 1,850 kcal. You should plan what to eat from TDEE, not BMR.

What is BMR?

BMR is the minimum energy needed to keep you alive if you lay still all day in a comfortable room: breathing, pumping blood, keeping your brain and organs working and maintaining body temperature. It is the largest part of daily energy use for most people, typically 60–70%.

BMR depends mainly on body size and composition. Larger bodies and more muscle burn more; BMR also falls slowly with age. Most calculators estimate it with the Mifflin–St Jeor equation:

• Women: 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161
• Men: 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5

What is TDEE?

TDEE adds three things on top of BMR:

Component	Typical share of TDEE	What it is
BMR	60–70%	Energy to stay alive at rest
Thermic effect of food (TEF)	About 10%	Energy used to digest and process food; higher for protein
Exercise (EAT)	Varies, often 5–10%	Planned workouts, sport, gym sessions
Non-exercise activity (NEAT)	Varies widely	Walking, standing, chores, fidgeting, your job

NEAT is the wild card. Two people with the same BMR can differ by several hundred calories a day simply because one has an active job and the other sits at a desk.

TDEE vs BMR in numbers

Calculators estimate TDEE by multiplying BMR by an activity factor. For the 65 kg woman above (BMR about 1,350 kcal):

Activity level	Multiplier	TDEE
Sedentary	1.2	1,610 kcal
Lightly active	1.375	1,850 kcal
Moderately active	1.55	2,090 kcal
Very active	1.725	2,320 kcal

Her TDEE ranges from about 1,610 to 2,320 kcal depending on activity alone. Work out your own figures with the calorie calculator.

Which number should you eat by?

TDEE. It is your maintenance level: eat about this much on average and your weight stays roughly stable.

• To lose weight, eat below TDEE. A deficit of about 500–550 kcal a day loses roughly 0.5 kg (1 lb) a week at first.
• To gain weight, eat a little above TDEE: about 250–300 kcal a day for slow, lean gains.
• Do not eat at or below BMR for long without medical supervision. That gap is the energy you need to move around, and very low intakes make it hard to get enough protein and nutrients.

Why your real TDEE may be different

Equations predict BMR for groups of people, and individuals can be about 10% higher or lower. Activity multipliers add more uncertainty, and people often overestimate how active they are. Fitness trackers help but tend to overestimate calories burned during exercise.

The most reliable way to find your true TDEE is to test it: eat a consistent amount for two to three weeks, weigh yourself at the same time each week, and adjust. If your weight is stable, you have found your maintenance calories.

Can you raise your BMR?

A little. Building muscle through strength training raises BMR modestly, and eating enough protein helps keep muscle when you diet. Moving more during the day raises NEAT, which often has a bigger effect on TDEE than any change to BMR. Plan your protein with the macro calculator.

Frequently asked questions

Is TDEE always higher than BMR?

Yes. TDEE is BMR plus the energy you use digesting food and moving, so it is always higher, usually by 20–90% depending on activity.

Should I eat my BMR to lose weight?

Eating at your BMR is usually too aggressive. Most people do better with a deficit of about 500 kcal below their TDEE, and should not eat at or below BMR long term without medical supervision.

How accurate are TDEE calculators?

They are good starting points, but individuals can be 10% or more above or below the estimate. Track your weight for two to three weeks and adjust.

Does BMR go down when you lose weight?

Yes. A smaller body needs less energy, so both BMR and TDEE fall as you lose weight. Recalculate every 5 kg or so.

Sources

• Mifflin MD et al. (1990). A new predictive equation for resting energy expenditure in healthy individuals
• NHS: Understanding calories
• NIDDK: Body Weight Planner