BMR is the baseline. TDEE includes the day.
Basal metabolic rate (BMR) is energy used to support essential functions under tightly controlled resting conditions. Total daily energy expenditure (TDEE) includes resting needs, digesting food, exercise, and other movement.
Many online calculators label their resting estimate “BMR,” although the Mifflin–St Jeor equation was developed to predict resting energy expenditure. Resting and basal measurements are related but use different testing conditions. An online estimate is not a laboratory measurement of either.
| Number | What it describes | How to use it |
|---|---|---|
| BMR / resting estimate | Energy needed at rest | An input into the daily estimate |
| TDEE | Total energy used over a day | An estimate of maintenance needs |
| Calorie target | The intake you plan | A separate planning decision |
Follow one example through the calculation
Take an 80 kg, 180 cm, 30-year-old using the male Mifflin equation. The estimated resting expenditure is:
10 × 80 + 6.25 × 180 − 5 × 30 + 5 = 1,780 kcal/day
Using an activity multiplier of 1.55 gives an estimated TDEE of:
1,780 × 1.55 = 2,759 kcal/day
A planning scenario 5% below that estimate would be approximately 2,621 kcal/day. That arithmetic is an example, not a personalized intake recommendation or a promise about weight change.
The activity multiplier is a large assumption
Two people can train three times a week and still have very different daily energy use. One may sit most of the day; the other may walk or lift at work. Exercise frequency alone is not enough to classify an entire week.
Brolic’s calculators use these conventional activity multipliers:
- Mostly seated, little exercise: 1.2.
- Light activity: 1.375.
- Moderate activity: 1.55.
- Very active days: 1.725.
These multipliers are rough assumptions added to the resting equation. They are not measured values. The activity choice already includes exercise, so adding another full workout-calorie estimate can count the same activity twice.
A resting estimate is not an eating target
BMR and TDEE describe expenditure. A calorie target describes intended intake. Neither estimated BMR nor a generic minimum automatically establishes a safe or effective target for a particular person.
Use a calculator to make the assumptions visible. For medical conditions, pregnancy, eating-disorder recovery, or circumstances outside general adult fitness planning, an individualized professional plan is more appropriate.
Use observations to give the estimate context
Record intake consistently, compare weight averages under similar conditions, and review energy and training performance over time. One day’s scale reading cannot validate a TDEE estimate.
Actual energy needs can change with body weight and activity. A calculator result should remain open to revision as you collect better information; it is not a permanent number to obey.
Sources & method
Written by the Brolic team. These references explain the evidence and assumptions; this page does not replace individualized professional advice.
- Mifflin et al. — A new predictive equation for resting energy expenditure — The source resting-energy equation.
- National Institute of Diabetes and Digestive and Kidney Diseases — Body Weight Planner — Energy requirements and body weight change over time.